D(f)=R
f'(x)=-6x^2-6x=-6x(x+1)
D(f')=R
f'(x)=0
-6x(x+1)=0
x=0
x=-1
1<=x<=3
f(1)=-2-3+4=-1
f(3)=-54-27+4=-77
На 1<=х<=3
fнаиб.=f(1)=-1
fнаим.=f(3)=-77
-27x2+405x+432=0
x2-15x-16=0
D=225+64=289=17 в квадрате
x 1= (15+17):2=16
x 2= (15-17):2=-1
х^3 - 3х^2 - 4х + 12 = 0
(x^3-3x^2)+(-4x+12)=0
x^2(x-3)-4(x-3)=0
(x^2-4)(x-3)=0
<span>x^2=4 или<span> x=3</span></span>
<span>x=±2</span>
<span>Ответ: -2; 2; 3.</span>