Question

Х²=-11х-28 решите уравнение

Answer 1

х²=-11х-28
х²+11х+28 = 0
D = 121-4*28 = 121-112 = 9
√D = 3
х1 =(-11+3)/2-8/2 = -4
х2 = (-11-3)/2 = -14/2 = -7

Answer 2

Х^2 = -11х - 28
х^2 + 11х + 28 = 0
D=11^2 - 4*1*28 = 121 - 112 = 9
х1= -11+√9 : 2 = -11+3 : 2=-8 : 2 = -4
х2 = -11-√9 : 2 = -11-3 : 2 = -14 : 2 = -7
Ответ: х1=-4 ; х2=-7.