Question

Алгебра номер 15.8.

Answer 1

1)

${x}^{2} + 6x = 0 \\ x(x + 1) = 0 \\ x = 0 \\ x + 6 = 0 \\ x = - 6$

2)

${x}^{2} - 5x = 0 \\ x(x - 5) \\ x = 0 \\ x - 5 = 0 \\ x = 5$

3)

$\frac{7}{5} x + {x}^{2} = 0 \\ {x}^{2} + \frac{7}{8} = 0 \\ x(x + \frac{7}{8}) = 0 \\ x = 0 \\ x + \frac{7}{8} = 0 \\ x = - \frac{7}{8}$

4)

$\frac{12}{13} x - {x}^{2} = 0 \\ {x}^{2} - \frac{12}{13}x = 0 \\ x(x - \frac{12}{13} ) = 0 \\ x = 0 \\ x = \frac{12}{13}$