5
Пошаговое объяснение:
f(-1) = -1-3+9 = 5
f(3) = 27-27-27 = -27
f'(x) = 3x²-6x-9 = 3*(x²-2x-3)
x²-2x-3=0
D = -2²-4*(-3) = 16
√D = 4
X1 = (2-4)/2 = -1
X2 = (2+4)/2 = 3
5
Пошаговое объяснение:
f(-1) = -1-3+9 = 5
f(3) = 27-27-27 = -27
f'(x) = 3x²-6x-9 = 3*(x²-2x-3)
x²-2x-3=0
D = -2²-4*(-3) = 16
√D = 4
X1 = (2-4)/2 = -1
X2 = (2+4)/2 = 3