Question

Решить уравнение:

1 – х – х2 = х – (х – 2) (х + 3) .

Answer 1

Ответ:

$1 - x - x^{2} = х - (x - 2)(x + 3) \\ 1 - x - x ^{2} = х - ( {x}^{2} + 3x - 2x - 6) \\ 1- x - {x}^{2} = х - {x}^{2} - 3x + 2x + 6 \\ - x - {x}^{2} + {x}^{2} + 3x - 2x - х = 6 - 1 \\ -х = 5 \\ х =- 5$