Algebra 1 Find the common ratio of each sequence. a. 3, –15, 75, –375,... 3–1575–375  (–5)  (–5)  (–5) The common ratio is –5. b. 3, 3232 3434 3838,,,...

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Presentation transcript:

Algebra 1 Find the common ratio of each sequence. a. 3, –15, 75, –375,... 3–1575–375  (–5)  (–5)  (–5) The common ratio is –5. b. 3, ,,,  1212  1212  1212 The common ratio is Lesson 8-6 Geometric Sequences Additional Examples

Algebra 1 Find the next three terms of the sequence 5, –10, 20, –40,... 5–1020–40  (–2)  (–2)  (–2) The common ratio is –2. The next three terms are –40(–2) = 80, 80(–2) = –160, and –160(–2) = 320. Lesson 8-6 Geometric Sequences Additional Examples

Algebra 1 Determine whether each sequence is arithmetic or geometric. a. 162, 54, 18, 6,  1313  1313  The sequence has a common ratio. Lesson 8-6 The sequence is geometric. Geometric Sequences Additional Examples

Algebra 1 (continued) b. 98, 101, 104, 107,... The sequence has a common difference The sequence is arithmetic. Lesson 8-6 Geometric Sequences Additional Examples

Algebra 1 Find the first, fifth, and tenth terms of the sequence that has the rule A(n) = –3(2) n – 1. first term: A(1) = –3(2) 1 – 1 = –3(2) 0 = –3(1) = –3 fifth term: A(5) = –3(2) 5 – 1 = –3(2) 4 = –3(16) = –48 tenth term: A(10) = –3(2) 10 – 1 = –3(2) 9 = –3(512) = –1536 Lesson 8-6 Geometric Sequences Additional Examples

Algebra 1 Suppose you drop a tennis ball from a height of 2 meters. On each bounce, the ball reaches a height that is 75% of its previous height. Write a rule for the height the ball reaches on each bounce. In centimeters, what height will the ball reach on its third bounce? The first term is 2 meters, which is 200 cm. Draw a diagram to help understand the problem. Lesson 8-6 Geometric Sequences Additional Examples

Algebra 1 (continued) The ball drops from an initial height, for which there is no bounce. The initial height is 200 cm, when n = 1. The third bounce is n = 4. The common ratio is 75%, or A rule for the sequence is A(n) = n – 1. A(n) = n – 1 Use the sequence to find the height of the third bounce. A(4) = – 1 Substitute 4 for n to find the height of the third bounce. = Simplify exponents. = Evaluate powers. = Simplify. The height of the third bounce is cm. Lesson 8-6 Geometric Sequences Additional Examples