What is a common ratio of -5, -20, -80?

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Answer 1 · 2018-06-26T11:14:17

4

$-5 xx 4 = -20$

$-20 xx 4 = -80$

Answer 2 · 2018-06-26T11:14:54

$color(blue)("Common ratio" = 4)$

If $a , b, c$ are in geometric sequence.

Then:

$b/a=c/b$ This is called the common ratio:

From given sequence:

$(-20)/(-5)=(-80)/(-20)=4$

The common ratio is $4$