A Brilliant Algebra Problem

Описание: A Brilliant algebra problem! Check out https://brilliant.org/blackpenredpen/ (20% off with this link)

We are given an exponential equation 2020^x+2020^-x=3 but we just have to evaluate that BIG square root expression. It is NOT a good idea to solve for x, but rather we should think about how we can do some "brilliant" algebra manipulation.

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