Question

For the following geometric sequence, find the recursive formula.
{-80, 20, -5, ...}

Answer 1

Answer: For the geometric sequence, it has two forms of formula

We are interested in the recursive formula now

{-80, 20, -5, ...}

The common ratio is (20/-80)=(-5/20)=-1/4=-0.25

So our recursive formula would be

Explanation:

Answer 2

For the geometric sequence, it has two forms of formula


We are interested in the recursive formula now


{-80, 20, -5, ...}

The common ratio is (20/-80)=(-5/20)=-1/4=-0.25

So our recursive formula would be
`a_n=a_(n-1)*(-0.25)=a_(n-1)*(- (1)/(4) )`


I hope that helps!