What is the common ratio of the geometric sequence #7, -14, 28, -56...#?

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Answer 1 · 2018-04-20T08:47:11

#color(blue)(-2)#

If:

#a,b,c# are a geometric sequence, then:

#b/a=c/b#

This is the common ratio:

From example:

#7,-14,28,-56...#

#(-14)/7=28/(-14)=-2#

Common ratio is:

#color(blue)(-2)#