Question

-x2+0,8x+2,4=0 будь ласка дуже треба

Answer 1

Пошаговое объяснение:

$- {x}^{2} + 0.8x + 2.4 = 0 \\ {x}^{2} - 0.8x - 2.4 = 0 \\ \\ d = 0.64 + 9.6 = 10.24 \\ \sqrt{d } = \sqrt{10.24} = 3.2 \\ \\ x1 = \frac{0.8 - 3.2}{2} = - \frac{2.4}{2} = - 1.2 \\ x2 = \frac{0.8 + 3.2}{2} = \frac{4}{2} = 2$