# How do you find the common ratio of the geometric sequence 7,-14,28,-56?

##### 1 Answer

Jul 1, 2017

#### Explanation:

#"the common ratio r of a geometric sequence is"#

#r=(a_2)/(a_1)=(a_3)/(a_2)=........ =a_n/(a_(n-1)#

#"here " a_1=7 , a_2=-14#

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