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Recursive & Explicit Formulas January 5 – 7, 2010

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January 6, 2010 Closed/Explicit Formula

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Warm Up (1/6) 1.You can burn 5 calories a minute from walking. Which set could represent the range of calories burned when walking between 1 and 5 minutes? a. {1,2,3,4,5}c. {5} b. {5,10,15,20,25} d. {1,5} 2.Which sequence is not a linear function? a. 1,2,3… c. 2,5,8… b. 1,4,9d. -12,-8,-4… 3.Given the first term in the sequence below, use the recursive formula given to find the next four terms of the sequence. a. 15,12,9,6c. -3,6,12,18 b. 18,15,12,9d. 18,12,6,-3

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Explicit Formula for the nth term of a sequence nth term 1 st term # of common the term difference trying to find Find the indicated term.

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What is the 23 rd term of the following sequence? 5, 12, 19, 26, … a 1 = 5; d = 7

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You Try! Find the 9 th term in the following sequence: 9, 2, -5, -12,… a 1 = 9; d = -7

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Practice 13, 25, 37, 49,… find the 25th term a 1 = 13; d = 12

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Write the equation for the nth term 17, 28, 39, 50, … a 1 = 17; d = 11 7, 4, 1, -2, … a 1 = 7; d = -3

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Sequence 1: -4, 1, 6, 11, … Find common difference (d) Write the sequence in explicit /closed form: t n = t 1 + (n-1)d t n = -4 + (n-1)(5) Find the 10th term --- Find the 25th term ---

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Sequence 2: 8, 5, 2, -1, … Find common difference (d) Write the sequence in explicit/closed form: t n = t 1 + (n-1)d t n = 8 + (n-1)(-3) Find the 10th term --- Find the 25th term ---

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Sequence 3: -2, -4, -6, -8, … Find common difference (d) Write the sequence in explicit/closed form: t n = t 1 + (n-1)d t n = -2 + (n-1)(-2) Find the 10th term --- Find the 25th term ---

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Sequence 4: 4, 7, 10, 13, … Find common difference (d) Write the sequence in explicit/closed form: t n = t 1 + (n-1)d t n = 4 + (n-1)(13) Find the 10th term --- Find the 25th term ---

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Homework Textbook p. 145; 39-42 and 45 ALL

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