Question

найдите сумму корней уравнения 2x^2-5x-3=0

Answer 1

${2x}^{2} - 5x - 3 = 0$

D=${b}^{2} - 4ac = 25 - 4 \times \times ( - 3) = \\ 25 + 24 = 49 = {7}^{2}$

$x1 = \frac{ 5 - 7}{4} = \frac{ - 2}{4} = - 0.5 \\ x2 = \frac{5 + 7}{4} = \frac{12}{4} = 3$

3+(-0.5)=2.5.

Голубая Даль ©