Beginning and Intermediate Algebra - Wallace Math Courses ...

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missing on each fraction. Example 351. � � 2 2 6 4(2a+1) 6 3a + 8a +4 8 Factor denominators to find LCD 4(2a+1) 8 LCD is 8(2a+1), build up each fraction + 3a 8 � � 2a +1 2a +1 12 8(2a +1) + 6a2 + 3a 8(2a +1) 6a 2 +3a + 12 8(2a+1) Multiply first fraction by 2, second by 2a+1 Add numerators Our Solution With subtraction remember to add the opposite. Example 352. x +1 x − 4 − x + 1 x2 − 7x + 12 Add the opposite (distribute negative) x +1 −x − 1 + x − 4 x2 − 7x + 12 Factor denominators to find LCD x − 4 (x − 4)(x − 3) LCD is (x − 4)(x − 3), build up each fraction � � x − 3 x +1 −x − 1 + x − 3 x − 4 x2 − 7x + 12 x2 − 2x − 3 (x − 3)(x − 4) + −x − 1 (x − 3)(x − 4) x 2 − 3x − 4 (x − 3)(x − 4) (x − 4)(x +1) (x − 3)(x − 4) x + 1 x − 3 Only first fraction needs to be multiplied by x − 3 Add numerators, combine like terms Factor numerator Divide out x − 4 factor Our Solution 260
7.4 Practice - Add <strong>and</strong> Subtract Add or subtract the rational expressions. Simplify your answers whenever possible. 1) 2 4 + a+3 a + 3 3) t2 + 4t t − 1 5) + 2t − 7 t − 1 2x2 + 3 x2 − 6x + 5 − x2 − 5x + 9 x2 − 6x + 5 7) 5 5 − 6r 8r 9) 8 9t 3 + 5 6t 2 11) a+2 2 13) 15) 17) 19) 21) 23) 25) 27) 29) 31) 33) 35) 37) 39) 41) 43) x − 1 4x 5x + 3y 2x 2 y − a − 4 4 − 2x + 3 x − 3x + 4y xy 2 2z 3z − z − 1 z + 1 8 x2 3 − − 4 x+2 t 5 − t − 3 4t − 12 2 5x2 4 − + 5x 3x + 3 t y − y − t y + t x x2 + 5x + 6 − 2 x2 + 3x + 2 x x2 + 15x+56 − 7 x2 + 13x + 42 5x x2 18 − − x − 6 x2 − 9 2x x 2 − 1 − 4 x 2 + 2x −3 x+1 x2 x + 6 + − 2x − 35 x2 + 7x+10 4 − a2 a2 a −2 − − 9 3 − a 2z 3z 3 + − 1 − 2z 2z + 1 4z2 − 1 2x − 3 x2 3x −1 + + 3x + 2 x2 + 5x+6 2x+7 x2 3x − 2 − − 2x − 3 x2 +6x +5 2) 4) x2 6x − 8 − x − 2 x − 2 a2 + 3a a2 + 5a − 6 − 4 a2 + 5a − 6 6) 3 4 + x x2 8) 261 7 xy2 + 3 x2y 10) x+5 8 12) 14) 16) 18) 20) 22) 24) 26) 28) 30) 32) 34) 36) 38) 40) 42) 44) + x − 3 12 2a − 1 3a2 + 5a+1 9a 2c − d c 2 d − c + d cd 2 2 2 + x − 1 x + 1 2 3 + x − 5 4x 4x x2 x + − 25 x + 5 2 4 + x+3 (x + 3) 2 3a 9a + 4a − 20 6a − 30 x x − 5 + x − 5 x 2x x 2 − 1 − 2x x 2 − 9 + 4x x 2 − 2x − 3 − 3 x 2 + 5x + 4 5 x 2 + x −6 3 x 2 −5x +6 x −1 x2 x + 5 + + 3x + 2 x2 + 4x+3 3x + 2 x + 3x + 6 4 − x2 4y y2 2 2 − − − 1 y y + 1 2r r2 − s2 + 1 1 − r + s r − s x + 2 x2 4x +5 + − 4x + 3 x2 + 4x − 5 3x − 8 x2 2x −3 + + 6x + 8 x2 + 3x+2
Page 1 and 2:
Beginning and Intermediate Algebra
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Special thanks to: My beautiful wif
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Chapter 6: Factoring 6.1 Greatest C
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0.1 Pre-Algebra - Integers Objectiv
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Multiplication and division of inte
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45) (4)( − 6) Find each quotient.
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9 ÷ 3 3 = 21 ÷ 3 7 Our Soultion T
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Example 21. 13 6 − 9 6 4 6 2 3 Sa
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Find each quotient. 37) − 2 ÷ 7
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the expression that is to be evalua
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Solve. 1) − 6 · 4( − 1) 3) 3+(
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It will be more common in our study
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0.4 Practice - Properties of Algebr
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Chapter 1 : Solving Linear Equation
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Addition Problems To solve equation
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8x = − 24 8 8 x = − 3 Division
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1.2 Linear Equations - Two-Step Equ
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− 1 − 1 Divide both sides by
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1.3 Solving Linear Equations - Gene
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Example 63. − 3x +9=6x − 27 Not
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4[ − 2]+9=−15 +8(2) Finish mult
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1.4 Solving Linear Equations - Frac
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Example 72. � � 3 5 4 x + = 3 2
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1.5 Solving Linear Equations - Form
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Example 79. A = πr 2 +πrs for s S
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1.5 Practice - Formulas Solve each
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|x| = 5 Absolute value can be posit
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Example 90. 7+|2x − 5| =4 Notice
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1.7 Solving Linear Equations - Vari
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Once we have found the constant of
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1.7 Practice - Variation Write the
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sure. If the pressure of a certain
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Fifteen more than three times a num
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When we started with our first, sec
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1.8 Practice - Number and Geometry
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30. The perimeter of a college bask
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Our equation comes from the future
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4x + 2=102 Solve the two − step e
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years ago, the bronze plaque was on
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1.10 Solving Linear Equations - Dis
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Rate Time Distance Bob r + 2 3 Fred
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2 =t Our solution fort, she catches
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Find the distance he rode. 8. A man
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The first plan is flying 25 mph slo
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2.1 Graphing - Points and Lines Obj
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E B D F G C A Our Solution The main
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x y − 3 − 4 0 − 2 3 0 Our com
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2.2 Graphing - Slope Objective: Fin
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When mathematicians began working w
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Example 131. Find the value of x be
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9) 10) Find the slope of the line t
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y = − 2 x + 3 Our Solution 3 Iden
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2.3 Practice - Slope-Intercept Writ
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2.4 Graphing - Point-Slope Form Obj
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Find the equation of the line throu
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Write the point-slope form of the e
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m = 2 5 m = 2 5 Example 147. Slope
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2.5 Practice - Parallel and Perpend
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Chapter 3 : Inequalities 3.1 Solve
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than 4. If we have an expression su
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− 5 − 5 − 2x � 6 Divide bot
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Solve each inequality, graph each s
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As the graphs overlap, we take the
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3.2 Practice - Compound Inequalitie
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edition of a college algebra text!
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It is important to remember as we a
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Chapter 4 : Systems of Equations 4.
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ested in the point that is a soluti
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that parallel lines have the same s
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4.2 Systems of Equations - Substitu
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tion. This process is described and
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World View Note: French mathematici
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31) 2x + y = 2 3x + 7y = 14 33) x +
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6x +9y = 6 New second equation −
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Just as with graphing and substutio
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4.4 Systems of Equations - Three Va
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just the ordered pair (x, y). In th
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15x − 12y +9z = − 12 5x − 4y
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23) 3x + 3y − 2z = 13 6x + 2y −
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are given to use. This means someti
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− 0.5 − 0.5 c=17 We have c, num
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− 0.06x − 0.06y = − 240 Add e
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14) A bank contains 27 coins in dim
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4.6 Systems of Equations - Mixture
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Amount Part Total Start 40 3 120 Ad
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4(30 −n)+2.5n=105 Substitute into
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16) A certain grade of milk contain
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175
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5.1 Polynomials - Exponent Properti
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A quicker method to arrive at the s
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Example 210. Example 211. 7a 3 (2a
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5.2 Polynomials - Negative Exponent
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As we simplified our fraction we to
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5.2 Practice - Negative Exponents S
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Example 223. Convert 3.21 × 10 5 t
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5.3 Practice - Scientific Notation
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World View Note: Ada Lovelace in 18
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21) (3+b 4 )+(7+2b + b 4 ) 22) (1+6
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Just as we distribute a monomial th
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Example 243. (2x − 5)(4x 2 − 7x
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5.6 Polynomials - Multiply Special
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Be very careful when we are squarin
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5.7 Polynomials - Divide Polynomial
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3. Change the sign of the terms and
Page 209 and 210: Example 261. 2x 3 + 42 − 4x x + 3
Page 211 and 212: Chapter 6 : Factoring 6.1 Greatest
Page 213 and 214: ers using mental math, then we take
Page 215 and 216: 6.1 Practice - Greatest Common Fact
Page 217 and 218: Example 273. 10ab + 15b + 4a+6 Spli
Page 219 and 220: example the binomials are (a + b) a
Page 221 and 222: 6.3 Factoring - Trinomials where a
Page 223 and 224: As the past few examples illustrate
Page 225 and 226: 6.3 Practice - Trinomials where a =
Page 227 and 228: Example 296. 10x 2 − 27x +5 Multi
Page 229 and 230: 6.5 Factoring - Factoring Special P
Page 231 and 232: Example 306. 4x 2 + 20xy + 25y 2 Mu
Page 233 and 234: 6.5 Practice - Factoring Special Pr
Page 235 and 236: Example 313. Example 314. Example 3
Page 237 and 238: 6.7 Factoring - Solve by Factoring
Page 239 and 240: 0=(2x +3)(2x − 3) One factor must
Page 241 and 242: 6.7 Practice - Solve by Factoring S
Page 243 and 244: 7.1 Rational Expressions - Reduce R
Page 245 and 246: However, if there is more than just
Page 247 and 248: 41) 8m+16 20m − 12 43) 2x2 − 10
Page 249 and 250: Example 333. 25x2 24y4 · 9y8 55x7
Page 251 and 252: Simplify each expression. 1) 8x2 9
Page 253 and 254: 7.3 Rational Expressions - Least Co
Page 255 and 256: As the above example illustrates, w
Page 257 and 258: 7.4 Rational Expressions - Add & Su
Page 259: 13 12 Our Solution The same process
Page 263 and 264: 2(12) 1(12) − 3 4 5(12) 1(12) + 6
Page 265 and 266: LCD =(x + 3)(x − 3) Multiply each
Page 267 and 268: 23) 25) 27) 29) x − 4+ 9 2x +3 x
Page 269 and 270: (20)(9)=6x Multiply 180 = 6x Divide
Page 271 and 272: 3.5 6 The man hasashadow of 3.5 fee
Page 273 and 274: 33) Kali reduced the size of a pain
Page 275 and 276: LCD will be more involved. We will
Page 277 and 278: x=5 or − 2 Our Solution World Vie
Page 279 and 280: 7.8 Rational Expressions - Dimensio
Page 281 and 282: � 435 1 �� 1 lbs = 16 435
Page 283 and 284: To focus on the process of conversi
Page 285 and 286: 7.8 Practice - Dimensional Analysis
Page 287 and 288: Chapter 8 : Radicals 8.1 Square Roo
Page 289 and 290: √ process is being able to transl
Page 291 and 292: Simplify. √ 1) 245 √ 3) 36 √
Page 293 and 294: Example 384. 3√ 54 We are working
Page 295 and 296: 8.3 Radicals - Adding Radicals Obje
Page 297 and 298: Simiplify 1) 2 5 √ + 2 5 √ + 2
Page 299 and 300: √ √ √ √ 4 50 + 6 30 − 8 3
Page 301 and 302: The previous example could have bee
Page 303 and 304: 8.5 Radicals - Rationalize Denomina
Page 305 and 306: 2x2 √ √ 10 − 6x 3x Our Soluti
Page 307 and 308: Example 408. 2 5 √ − 3 7 √ 5
Page 309 and 310: 37) 5 2 √ + 3 √ 5+5 2 √ 38) 3
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1 (3) 4 Evaluate exponent 1 81 Our
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8.6 Practice - Rational Exponents W
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Example 420. ab2 3√ a2 4√ b Rew
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8.7 Practice - Radicals of Mixed In
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Example 426. Example 427. i 35 Divi
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√ Dividing with complex numbers a
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Simplify. 1) 3 − ( − 8+4i) 3) (
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Chapter 9 : Quadratics 9.1 Solving
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Example 444. + 1 +1 Add1to both sid
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2 − 2=0 Subtract 0=0 True! It wor
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Solve. √ 1) 2x + 3 √ 3) 6x −
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x4 4√ = ± 4√ 16 Simplify roots
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5√ 4x +1 = ± 3 Clear radical by
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9.3 Quadratics - Complete the Squar
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x2 + 5 25 x+ 3 36 � x + 5 �2 6
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Example 464. − 7 3 � 3 3 + 3 3
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9.4 Quadratics - Quadratic Formula
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x = Example 468. √ 30 ± 900 + 11
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9.4 Practice - Quadratic Formula So
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12x 2 − 17x + 6=0 Our Solution If
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9.5 Practice - Build Quadratics fro
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Example 479. a −2 − a −1 −
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12 = (x − 3) 2 or 13 =(x − 3) 2
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9.7 Quadratics - Rectangles Objecti
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Example 486. 2 Our Solution The len
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4(x 2 + 10x − 24) =0 Factor trino
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that require 24 square meters for p
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1(12x) 3 + 1(12x) x 1 1 5 + = 3 x 1
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6x +6(x − 1)=5x(x − 1) Reduce e
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16) A sink can be filled from the f
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These simultaneous product equation
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9.10 Quadratics - Revenue and Dista
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96n(n − 2) 96n(n − 2) +4n(n −
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upstream, the current will pull aga
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12) A pilot flying at a constant ra
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The above method to graph a parabol
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It is important to remember the gra
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Chapter 10 : Functions 10.1 Functio
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Example 504. Which of the following
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2x − 3 � 0 Set up an inequality
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Solve. 10.1 Practice - Function Not
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10.2 Functions - Operations on Func
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(x − 5)(x +1) (x − 5) Divide ou
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We can also evaluate a composition
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23) f(x) = x 2 − 5x g(x) = x + 5
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10.3 Functions - Inverse Functions
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(3x +6)(3 − 4x) 3 − 4x (4x+8)(3
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10.3 Practice - Inverse Functions S
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Example 530. 8 3x = 32 Rewrite 8 as
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10.4 Practice - Exponential Functio
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log3x =7 Identify base, 3, answer,
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10.5 Practice - Logarithmic Functio
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A = 25000(1.01625) 20 Evaluate expo
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The variable e is a constant simila
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j. All of the above compounded cont
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Using the diagram at right, find ea
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10.7 Practice - Trigonometric Funct
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21) 23) 25) 27) A B A 5 38 ◦ x x
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37) 39) A A 37.1 ◦ C x x C 13.1 4
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θ 17 From angle θ the given sides
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function to find the missing angle
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Find the measure of each angle indi
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27) 29) 14 A A θ C 15 7 C 14 θ B
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437
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7) 5 4 8) 4 3 9) 3 2 10) 8 3 11) 5
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54) 60v − 7 55) − 3x + 8x 2 56)
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45) 12 46) All real numbers 47) No
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15) wx 3 = 1458 16) h = 1.5 j 17) a
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1) B(4, − 3) C(1, 2) D( − 1, 4)
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1) y = 2x +5 2) y = − 6x +4 3) y
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23) x =4 24) y − 4 = 7 (x − 1)
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25) 5�x
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1) ( − 2, 4) 2) (2,4) 3) No solut
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27) 56, 144 28) 1.5, 3.5 29) 30 30)
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42) 1.2 × 10 6 5.4 1) 3 2) 7 3)
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5) 2x 3 + 4x 2 + x 2 6) 5p3 4 +4p2
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7) (b +8)(b + 4) 8) (b − 10)(b
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11) n(n − 1) 12) (5x +3)(x − 5)
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5) 3x2 2 6) 5p 2 7) 5m 8) 7 10 9) r
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7) 8) 5 24r 7x + 3y x 2 y 2 9) 15t+
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21) 0, 5 22) − 2, 5 3 23) 4,7 24)
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42) − 18xz 4x3yz3 � 4 8.3 1) 6
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16 3 √ + 4 5 √ 43 18) 19) 2 √
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8.8 1) 11 − 4i 2) − 4i 3) − 3
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√ √ 33) 4+i 39, 4 −i 39 34)
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9) ± 2, ± 4 10) 2,3, − 1 ±i 3
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1) 2) 3) 4) 5) 6) (-2,0) (0,-8) (-1
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11) 100 12) − 74 13) 1 5 14) 27 1
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10.5 1) 9 2 = 81 2) b −16 = a 3)
Page 489:
21) 51.3 ◦ 22) 45 ◦ 23) 56.4
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