Question

5 x $5 x^{2} - 125=0$

Answer 1

$5 \times 5 {x}^{2} - 125 = 0 \\ 25 {x}^{2} - 125 = 0 \\ 25 {x}^{2} = 125 \\ {x}^{2} = \frac{125}{25} \\ {x}^{2} = 5 \\ x = \sqrt{5} \: ou \: x = - \sqrt{5}$