Solve the Equation by the Square Root Property $$x ^ { 2 } = 225$$

Multiple Choice

Solve the equation by the square root property.
- $$x ^ { 2 } = 225$$

A) $\{ \pm 15 \}$
B) $\{ 112.5 \}$
C) $\{ 15 \}$
D) $\{ \pm 15 \mathrm { i } \}$