X³ + (m - 1)x + m = 0
x(x² + m - 1) + m = 0
x(x² - 1) + m(x + 1) = 0
x(x - 1)(x + 1) + m(x + 1) = 0
(x + 1)(x(x - 1) + m) = 0 x = -1
x² - x + m = 0 D = b²-4ac = 1-4m
x₁ = (1+√(1-4m))/2
x₂ = (1-√(1-4m))/2
Ответ: {-1; (1+√(1-4m))/2; (1-√(1-4m))/2}
Х^2 - 3х = 18
Х^2 - 3х - 18 = 0
D = 9 + 72 = 81 ; V D = 9
X1 = ( 3 + 9 ) : 2 = 6
X2 = ( 3 - 9 ) : 2 = - 3
Ответ 6 ; - 3
1) 3х-5=3×3-5=4
3×0-5= -5
3×(-1)-5=-3-5= -8
3×7/3-5=21/3-5=7-5=2