Question

-x^2-5x-6=0 через дискриминант

Answer 1

$D = {b}^{2} - 4ac = {( - 5)}^{2} - 4 \times ( - 1) \times ( - 6) = 25 + 4 \times ( - 6) = 25 - 24 = 1$

$x1 = \frac{ - b - \sqrt{D} }{2a} = \frac{ - ( - 5) - 1}{2 \times ( - 1)} = \frac{4}{ - 2} = - 2$

$x2 = \frac{ - b + \sqrt{D} }{2a} = \frac{ - ( - 5) + 1}{2 \times ( - 1)} = \frac{6}{ - 2} = - 3$

ответ: корни -2 и -3