F`(x)=(10x-35)e^(x-11) +e^(x-11)*(5x²-35x+55)=e^(x-11)*(10x-35+5x²-35x+55)=
=e^(x-11)*(5x²-25x+20)=0
5(x²-5x+4)=0
x1+x2=5 U x1*x2=4
x1=1 U x2=4
+ _ +
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1 4
max min
y(1)=(5-35+55)e^(-10)=25/e^10 наиб
y(4)=(80-140+55)e^(-7)=-5/e^7 наим