SOLUTION: 3^2x + 3^-2x = 14 3^x + 3^-x = ?

Question 1020933: 3^2x + 3^-2x = 14
3^x + 3^-x = ?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
The answer is 4.
To see why,
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<==>
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By the quadratic formula, we then get

<==> ==>
(Note that these two values are inverses of each other, so that will have only one value, regardless whether we choose or .)
==>
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