SOLUTION: The sum of first four terms of G.P. is 30 and sum of first and last term is 18, then find G.P.

SOLUTION: The sum of first four terms of G.P. is 30 and sum of first and last term is 18, then find G.P.

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Question 1098693: The sum of first four terms of G.P. is 30 and sum of first and last term is 18, then find G.P.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

.
.
.

Let's use a substitution for better readability,

So then,

and

So,

Four r solutions,

We throw out and since the assumption was made when we cross multiplied that and .
So when, ,

and when

So then the geometric progression can be,
{2,4,8,16}
or
{16,8,4,2}

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