Question

2х²-х-1=х²-5х-(-1-х²)​

Answer 1

Ответ:

$2 {x}^{2} - x - 1 = x ^{2} - 5x + 1 + {x}^{2} \\ 2 {x}^{2} - {x}^{2} - {x}^{2} - x + 5x = 1 + 1 \\ 4x = 2 \\ x = \frac{2}{4} \\ x = \frac{1}{2}$