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

1 answer:

3 0

x^2 = 81
x = ±√81
x = ±9

x^2 = -9 no solutions

x^2 = 20
x = ±√20
x = ±2√5

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

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