SOLUTION: if the 3rd term of a G.P. is the square of its first term and its 5th term is 64, find its first term and the common ration.
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Question 401429: if the 3rd term of a G.P. is the square of its first term and its 5th term is 64, find its first term and the common ration.
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
==> .
Now ==> ==> r = -2, 2.
==> .
Incidentally there are two G.P.'s that satisfy the initial conditions.
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