SOLUTION: sum of infinite gp is 2 and sum of their cubes of the terms is 8/7 find gp

Question 1112554: sum of infinite gp is 2 and sum of their cubes of the terms is 8/7 find gp
Answer by math_helper(2461) (Show Source): You can put this solution on YOUR website!
The first equation needed is:
= 2
The 2nd equation may not be as obvious but if you substitute and into the infinite sum formula for a GP, you will find:
= 8/7

These two equations can be solved for
and
��
The work-out:
�>
�>
So
�. after some algebra ...

This has solutions , and
but only maintains (as required for convergence of infinite GP)

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