Question #N276
If $x^2 - 4 = 0$, what is the value of $x$?
A. -2
B. 2
C. 4
D. -2 and 2
Correct Answer is: D
The equation $x^2 - 4 = 0$ can be factored as $(x+2)(x-2) = 0$. For this equation to be true, either $(x+2) = 0$ or $(x-2) = 0$. Solving for $x$ in both cases gives us $x = -2$ or $x = 2$.