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D(y)=R
y'(x)=3x^2-3
D(y')=R
y'(x)=0
3x^2-3=0
x^2=1
x=1
x=-1
-3<=x<=3
x=1
x=-1
y(-3)=-27+9+8=-10
y(3)=27-9+8=26
y(-1)=-1+3+8=10
y(1)=1-3+8=6
На отрезке [-3;3]
унаиб.=у(3)=26
унаим.=у(-3)=-10
1)D = (-10)ˇ2- 4.1.21=100-84=16
2a)(7x+1)ˇ2=0, 7x+1=0, x=-1/7 (dvuxkpatnyj koren)
b) V R neimeet uravnenie rešenie.
3)xˇ2-10x+21=0,(x-3)(x-7)=0,a)x-3=0,x=3,b)x-7=0,x=7
X(x^2-8x+16)
x(x-4)^2
x(x-4)(x-4)