Question

Помогите!!!!!!!!!!!!!!!!!!!!!​

Answer 1

Решение:

$- 3x {}^{2} - x + 8 = (x - 3) {}^{2} \\ \\ - 3x {}^{2} - x + 8 = x {}^{2} - 6x + 9 \\ \\ - 3x {}^{2} - x + 8 - x {}^{2} + 6x - 9 = 0 \\ \\ - 4x {}^{2} + 5x - 1 = 0 \\ \\ 4x {}^{2} - 5x + 1 = 0 \\ \\ d = ( - 5) {}^{2} - 4 \times 4 \times 1 = 25 - 16 = 9 \\ \\ x1 = \frac{5 - 3}{8} = \frac{2}{8} = \frac{1}{4} = 0.25 \\ \\ x2 = \frac{5 + 3}{2} = \frac{8}{8} = 1$

Ответ: 0.25