y=x³-27x+11
y´=3x²-27
y´= 0 , 3x²-27=0, x²=9 , x=3 ∨ x=-3
y´´ =6x
y´´ (3)=18 , x=3 min.
y´´ (-3)=-18, x=-3 max.
y(3)=3³-27.3+11=27-81+11=27-70=-43
min.: P(3,-43)
y=x³-27x+11
y´=3x²-27
y´= 0 , 3x²-27=0, x²=9 , x=3 ∨ x=-3
y´´ =6x
y´´ (3)=18 , x=3 min.
y´´ (-3)=-18, x=-3 max.
y(3)=3³-27.3+11=27-81+11=27-70=-43
min.: P(3,-43)