Percent - XYZ Custom Plus

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362Chapter 5 <strong>Percent</strong>4. Find the value of the followingexpression when x is 10 andy is 4:_3x + y3x − y Example 4Find the value of 4x + ySolutiony with 2 to get_when x is 5 and y is 2:4x − yThis time we have two different variables. We replace x with 5 and_4(5) + 2 = 20_ + 24(5) − 2 20 − 2 = 22 _18 = 11 _9 5. Find the value of(4x + 1)(4x − 1) when x is 2.Example 5Find the value of (2x + 3)(2x − 3) when x is 4.SolutionReplacing x with 4 in the expression, we have:(2 ⋅ 4 + 3)(2 ⋅ 4 − 3) = (8 + 3)(8 − 3)= (11)(5)= 556. Find the value of the followingexpression when x is 5._x3 + 8x + 2 Example 6Find the value of x3 − 8Solution when x is 5:x − 2_We substitute 5 for x and then simplify:_53 − 8= 125_ − 85 − 2 3= 117 _3 = 39Answers4. _17 5. 63 6. 1913
Problem A Glimpse Set of 5.6 Algebra ProblemsFind the value of each of the following expressions for the given values of the variables.1. 6x + 2x − 7 when x is 293. 4x + 6x + 8x when x is 101804a + 205. _ when a is 55a − 2082a + 3a + 17. __ when a is 38. 7a + a + 44a + 5a + 3_815 9. x 2 + 5x + 6 when x is 22011. x 2 + 10x + 25 when x is 13613. _3x + y when x is 5 and y is 214. 5x − y3x − y_1713 = 14 _13 A Glimpse of Algebra Problems2. 8x + 10x − 5 when x is 3494. 9x + 2x + 20x when x is 51556. _4a + 8 when a is 83a − 82_ 1 2 __ when a is 106a + 2a + 3_ 8483 = 1 _ 183 10. x 2 + 6x + 8 when x is 68012. x 2 + 10x + 25 when x is 025_ when x is 10 and y is 55x + y_ 911 363
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Chapter PretestThe pretest below co
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304Chapter 5 PercentBChanging Perce
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306Chapter 5 PercentWho Pays Health
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308Chapter 5 PercentNoteWhen roundi
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310Chapter 5 PercentD Change each p
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