A)f(x)=(x²-6x+11)=2x-6
б) х=-1
tga=f(-1)=2*(-1)-6=-8
x=0
tga=f(0)=0-6=-6
x=2
tga=f(2)=2*2-6=-2

в) tga=0
f(x)=0
2x-6=0
x=3
tga=1
2x-6=1
2x=7
x=3.5
tga=3
2x-6=3
2x=9
x=4.5