Asked by thabang
in a geometric sequence,the fifth term is four times the third term,and the second term is 4.if r<0 determine the value of r,the common ratio
Answers
Answered by
Damon
a r^4 = 4 a r^2
r^2 = 4
r = +/- 2
-2
r^2 = 4
r = +/- 2
-2
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