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#