Question

5x^2-16x-16=0
Срочно помогите

Answer 1

Ответ:

-0,8; 4

Объяснение:

$5 {x}^{2} - 16x - 16 = 0 \\ D = {( - 16)}^{2} - 4 \times 5 \times ( - 16) = 256 + 320 = 576 \\ \sqrt{D} = \sqrt{576} =24 \\ x_{1} = \frac{16 + 24}{2 \times 5} = \frac{40}{10} = 4 \\ x_{2} = \frac{16 - 24}{2 \times 5} = - \frac{8}{10} = - 0.8$