Question

What is the first four terms of the geometric sequence where a1=−8 and r=−2 ?

(explanations appreciated!)

Answer 1

-8, 16, -32, 64

Explanation:

a1 = -8

r = -2

a2 = -8(-2)=16

a3 = -8(-2)²=-8(4)=-32

a4=-8(-2)³=-8(-8)=64