Question #N470
What is the value of $x$ in the equation $x^2 - 9 = 0$?
A. -3
B. 3
C. -3 or 3
D. 9
Correct Answer is: C
To solve for $x$, we can add 9 to both sides of the equation: $x^2 = 9$. Taking the square root of both sides gives us $x = \pm 3$. Therefore, the solutions are $x = -3$ or $x = 3$.