Question

Solve: x^2 = 81 x^2 = -9 x^2 = 20 3x^2 = 125

Answer 1

x^2 = 81
x = ±√81
x = ±9

x^2 = -9 no solutions 

x^2 = 20
x = ±√20
x = ±2√5

$3x^2 = 125 \\ x^2 = \frac{125}{3} \\ x=б \sqrt{ \frac{125}{3} }$