Question

What are the solution(s) of x2 - 4 = 0

Answer 1

x = -2 or x = 2

Explanation:

`x^2-4=0\qquad\text{add 4 to both sides}\\\\x^2-4+4=0+4\\\\x^2=4\to x=\pm\sqrt4\\\\x=-2\ \vee\ x=2`