Question

25 x во второй минус 4 равно нулю​

Answer 1

$25 {x}^{2} - 4 = 0 \\ 25 {x}^{2} = 4 \\ {x}^{2} = \frac{4}{25} \\ x = \frac{2}{5} \\ x = - \frac{2}{5}$