Question

Помогите с алгеброй,25 баллов

Answer 1

Ответ:

$- 2x {}^{2} + 7x - 6 = 0 \\ d = b { - 4ac }^{2} \\ d = 7 {}^{2} - 4 \times ( - 2) \times ( - 6) = 49 - 48 = 1 \\ x = \frac{ - 7 + 1}{2 \times ( - 2)} = \frac{ - 7}{ - 4} = 1 \frac{3}{4} \\ x = \frac{ - 7 - 1}{2 \times ( - 2)} = \frac{ - 8}{ - 4} = 2$

$x {}^{2} + 14x + 49 = 0 \\ d = 14 {}^{2} - 4 \times 49 = 196 - 196 = 0$