Question

помогите решить 2 уровнения ​

Answer 1

Ответ:

$2) {5x}^{2} - 6x + 40x - 48 \\ - 20 = {5x}^{2} \\ 5 {x}^{2} + 34x - 68 = 5 {x}^{2}$

$5 {x}^{2} + 34x - 68 - 5 {x}^{2} = 0 \\ 34x - 68 = 0 \\ 34x = 0 + 68 \\ 34x = 68$

$x = 68 \div 34 \\ x = 2$