Question

-x²-5x+6=0
Решить уравнение.

Answer 1

-x²- 5x+6=0
D = b² - 4ac = (-5)² - 4 *(-1)*6 = 25 + 24 = 49
x1 = $frac{-b + sqrt{D} }{2a}$ = $frac{5+7}{-2}$ = $frac{12}{-2}$ = - 6
x2 = $frac{-b - sqrt{D} }{2a}$  = $frac{5-7}{-2}$ = $frac{-2}{-2}$ = 1