Solve:

5 - √(x^2 - 7) = x - 2

Answer key = 4

If I square both sides, I end up with x^2 and I don't know how to get rid of the ^2.

Please help.

(If answer key cannot be reached, I think x^2 could be x^7 as the printing of the exponent is a superscript which is too small to read)