Question

-2x²+10x-8=0. помогите​

Answer 1

Привет!)

$- 2 {x}^{2} + 10x - 8 = 0 \\ 2 {x}^{2} - 10x + 8 = 0 \\ {x}^{2} - 5x + 4 = 0 \\ d = 25 - 4 \times 4 = 9 \\ x1 = \frac{5 + 3}{2} = 4 \\ x2 = \frac{5 - 3}{2} = 1$