ДАЮ 30 БАЛЛОВ! РЕШИТЕ ПЖ!

$1) {x}^{2} - 4 = 0 \\ {x}^{2} = 4 \\ x1 = 2 \\ x2 = - 2$

$2)9 {x}^{2} = 0 \\ x = 0$

$3)5 \frac{2}{3} {x}^{2} = 0 \\ x = 0$

$4) - 14 {x}^{2} = 56 \\ {x}^{2} = - 4$

Нет решения

$5) \frac{3}{11} {x}^{2} = 33 \\ {x}^{2} = 33 \div \frac{3}{11} = \frac{33 \times 11}{3} =$

${x}^{2} = 121 \\ x1 = - 11 \\ x2 = 11$

$6)14x(x - 10) = 0 \\ 14x = 0 \\ x = 0 \\ x - 10 = 0 \\ x = 10$

$7) - x(x + 8) = 0 \\ - x = 0 \\ x = 0 \\ x + 8 = 0 \\ x = - 8$

$8)2 {x}^{2} - 4x - 4 {x}^{2} - 3x = 0 \\ - 2 {x}^{2} - 7x = 0 \\ - x(2x + 7) = 0 \\ x = 0 \\ 2x + 7 = 0 \\ 2x = - 7$

$2x + 7 = 0 \\ 2x = - 7 \\ x = - 7 \div 2 \\ x = - 3.5$