Solve the Equation by the Square Root Property $$x ^ { 2 } = 20$$

Multiple Choice

Solve the equation by the square root property.
- $$x ^ { 2 } = 20$$

A) $\{ 400 \}$
B) $\{ \pm 2 \sqrt { 5 } \}$
C) $\{ 10 \}$
D) $\{ \sqrt { 20 } \}$