Question

Describe two different methods for solving the equation X to the 2nd - 4 = 0

Answer 1

You can add 4 to both sides and take the square root to see that x is +2 or -2.

The other method would be to factor it out into (x+2)(x-2)=0 so you know x=2 and -2 because either one would set the bracket =0 and make the whole thing=0