Write the recursive formula for the geometric sequence. a1 = -2 a2 = 8 a3 = -32 a. an = -4 an-1 b. an = -2 an-1 c. an = -2 • an-1 d. an = -4 • an-1

asked Jan 6, 2017 128k views

4 votes

Write the recursive formula for the geometric sequence. a1 = -2 a2 = 8 a3 = -32

a. an = -4 an-1
b. an = -2 an-1
c. an = -2 • an-1
d. an = -4 • an-1

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4 votes

an = -4 + an-1
This is the answer, Hope it helps!

DrDirk answered Jan 8, 2017

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7 votes

a1 = -2
a2 = 8 = -4 x -2 = -4a1
a3 = -32 = -4 x 8 = -4a2

Therefore, an = -4 * an-1

Uniqua answered Jan 10, 2017

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