Question

What is the solution set for the equation x^2-4=0. The choices are (1,4); (-2,2); (-4,1); and (0,4). Please explain!

Answer 1

Plug in the values of the coordinates for each of the x and then see which one gives you 0 to be the answer.

Answer 2

\[x^2-4=0\\
x^2=4\\
x=\pm\sqrt4\\
x=\pm 2\]