Question

С решением пожалуйста ❤️

Answer 1

Ответ:

$1)6x - 4 = 1 \\ 6x = 1 + 4 \\ 6x = 5 \\ x = 5 \div 6 \\ x = \frac{5}{6}$

$2) {x}^{2} - 3x = (x + 3) {}^{2} \\ {x}^{2} - 3x = {x}^{2} + 6x + 9 \\ {x}^{2} - 3x - {x}^{2} - 6x - 9 = 0 \\ - 9x - 9 = 0 \\ - 9x = 9 \\ x = 9 \div ( - 9) \\ x = - 1$

$3)3x - 1 = x - 5 \\ 3x - 1 - x + 5 = 0 \\ 2x + 4 = 0 \\ 2x = 0 - 4 \\ 2x = - 4 \\ x = - 4 \div 2 \\ x = - 2$

$4) {x}^{2} - 7x - 9 = 9 \\ {x}^{2} - 7x - 9 - 9 = 0 \\ {x}^{2} - 7x - 18 = 0 \\ d = 49 + 72 = 121 = {11}^{2}$

$x1 = \frac{7 + 11}{2} = \frac{18}{2} = 9 \\ x2 = \frac{7 - 11}{2} = - \frac{4}{2} = - 2$