Question

PLEASE HELP ME! For a geometric sequence, if a1 = 2 and a5 = 1250, what is the value of r?​

Answer 1

Answer: r = 5

Steps:

`a_n=ar^(n-1)`

1. add Values to formula

`1250=2r^(5-1)`

2. get r alone

`(1250)/(2)=(2r^(4))/(2)` ➜
`625= r^4`
3. get rid of the exponents

`\sqrt[4]{625}= \sqrt[4]{r^4}` ➜
`\sqrt[4]{625}= r=5`

r = 5