Hello,

X + 1/X = 3 , then X^2 + 1/X^2 =.........

I tried solving it million times but yet i didn't find the correct answer..

It is 7 but i don't know the proof or how the model answer got it.

I got 9 by:

Square both sides

X^2 + 1/X^2=9 = X^2 + 1/X^2 = 9 as well?

Guest May 2, 2019