Use the square root method to solve the equation. $x ^ { 2 } = 16$
A) $\pm 4$
B) $1$
C) $4$
D) $- 1$
E) $- 4$

Question

Quizplus · Accepted Answer

To solve for x, we take the square root of both sides. 
\begin{align*}
x^2 &= 16 \
\sqrt{x^2} &= \sqrt{16} \
|x| &= 4 \
x &= \pm 4
\end{align*}
Since the equation has a square term, there are two solutions: 4 and -4, which are represented by $\pm 4$. Therefore, the answer is choice A.

Use the Square Root Method to Solve the Equation x2=16x ^ { 2 } = 16x2=16

Use the Square Root Method to Solve the Equation $x ^ { 2 } = 16$