Question

What are the solution(s) of x^2-4=20?

Answer 1

`x^2-4=20\qquad|+4\\\\x^2=24\to x=\pm√(24)\\\\x=-√(4\cdot6)\ \vee\ x=√(4\cdot6)\\\\x=-2\sqrt6\ \vee\ x=2\sqrt6`