C. DISCRETE FUNCTIONSTHE ONTARIO CURRICULUM, GRADES 11 AND 12 | <strong>Mathematics</strong> Grade 11, University PreparationOVERALL EXPECTATIONSBy the end of this course, students will:1. demonstrate an understanding of recursive sequences, represent recursive sequences in a variety ofways, and make connections to Pascal’s triangle;2. demonstrate an understanding of the relationships involved in arithmetic and geometric sequencesand series, and solve related problems;3. make connections between sequences, series, and financial applications, and solve problems involvingcompound interest and ordinary annuities.SPECIFIC EXPECTATIONS1. Representing SequencesBy the end of this course, students will:1.1 make connections between sequences anddiscrete functions, represent sequences usingfunction notation, and distinguish between adiscrete function and a continuous function[e.g., f(x) = 2x, where the domain is the set ofnatural numbers, is a discrete linear functionand its graph is a set of equally spaced points;f(x) = 2x, where the domain is the set of realnumbers, is a continuous linear function andits graph is a straight line]1.2 determine and describe (e.g., in words; usingflow charts) a recursive procedure for generatinga sequence, given the initial terms(e.g., 1, 3, 6, 10, 15, 21, …), and representsequences as discrete functions in a varietyof ways (e.g., tables of values, graphs)1.3 connect the formula for the nth term of asequence to the representation in functionnotation, and write terms of a sequence givenone of these representations or a recursionformula1.4 represent a sequence algebraically using arecursion formula, function notation, or theformula for the nth term [e.g., represent 2, 4,8, 16, 32, 64, … as t 1 = 2; t n = 2t n – 1 , asnn1 2 3f(n) = 2 , or as t n = 2 , or represent , , ,2 3 44 5 611, , , … as t 1 = ; t n = t n – 1 + ,5 6 72n(n + 1)nnas f(n) = , or as t n = , where nn + 1n + 1is a natural number], and describe the informationthat can be obtained by inspectingeach representation (e.g., function notationor the formula for the nth term may showthe type of function; a recursion formulashows the relationship between terms)Sample problem: Represent the sequence0, 3, 8, 15, 24, 35, … using a recursionformula, function notation, and the formulafor the nth term. Explain why this sequencecan be described as a discrete quadraticfunction. Explore how to identify a sequenceas a discrete quadratic function by inspectingthe recursion formula.1.5 determine, through investigation, recursivepatterns in the Fibonacci sequence, in relatedsequences, and in Pascal’s triangle, andrepresent the patterns in a variety of ways(e.g., tables of values, algebraic notation)1.6 determine, through investigation, anddescribe the relationship between Pascal’striangle and the expansion of binomials,and apply the relationship to expand binomialsraised to whole-number exponents4 5 6 2 5[e.g., (1 + x) ,(2x–1) , (2x – y), (x + 1) ]50
2. Investigating Arithmetic andGeometric Sequences and SeriesBy the end of this course, students will:2.1 identify sequences as arithmetic, geometric,or neither, given a numeric or algebraicrepresentation2.2 determine the formula for the generalterm of an arithmetic sequence [i.e.,t n = a + (n –1)d ] or geometric sequence(i.e., t n = ar n –1 ), through investigationusing a variety of tools (e.g., linking cubes,algebra tiles, diagrams, calculators) andstrategies (e.g., patterning; connecting thesteps in a numerical example to the steps inthe algebraic development), and apply theformula to calculate any term in a sequence2.3 determine the formula for the sum of anarithmetic or geometric series, through investigationusing a variety of tools (e.g., linkingcubes, algebra tiles, diagrams, calculators)and strategies (e.g., patterning; connectingthe steps in a numerical example to the stepsin the algebraic development), and applythe formula to calculate the sum of a givennumber of consecutive termsSample problem: Given the following arraybuilt with grey and white connecting cubes,investigate how different ways of determiningthe total number of grey cubes can beused to evaluate the sum of the arithmeticseries 1 + 2 + 3 + 4 + 5. Extend the series,use patterning to make generalizations forfinding the sum, and test the generalizationsfor other arithmetic series.3. Solving Problems InvolvingFinancial ApplicationsBy the end of this course, students will:3.1 make and describe connections betweensimple interest, arithmetic sequences, andlinear growth, through investigation withtechnology (e.g., use a spreadsheet orgraphing calculator to make simple interestcalculations, determine first differences inthe amounts over time, and graph amountversus time)Sample problem: Describe an investmentthat could be represented by the functionf(x) = 500(1 + 0.05x).3.2 make and describe connections betweencompound interest, geometric sequences,and exponential growth, through investigationwith technology (e.g., use a spreadsheetto make compound interest calculations,determine finite differences in the amountsover time, and graph amount versus time)Sample problem: Describe an investmentthat could be represented by the functionxf(x) = 500(1.05) .3.3 solve problems, using a scientific calculator,that involve the calculation of the amount,A (also referred to as future value, FV ),the principal, P (also referred to aspresent value, PV ), or the interest rateper compounding period, i, using thecompound interest formula in the formnnA = P(1 + i) [or FV = PV(1 + i) ]Sample problem: Two investments areavailable, one at 6% compounded annuallyand the other at 6% compounded monthly.Investigate graphically the growth of eachinvestment, and determine the interestearned from depositing $1000 in eachinvestment for 10 years.FunctionsMCR3U2.4 solve problems involving arithmetic and geometricsequences and series, including thosearising from real-world applications3.4 determine, through investigation usingtechnology (e.g., scientific calculator, theTVM Solver on a graphing calculator, onlinetools), the number of compounding periods, n,using the compound interest formula in thennform A = P(1 + i) [or FV = PV(1 + i) ];describe strategies (e.g., guessing and checking;using the power of a power rule forexponents; using graphs) for calculating thisnumber; and solve related problemsDISCRETE FUNCTIONS51
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The Ministry of Education wishes to