Y=f(x0)+f'(x0)(x-x0)
a) y=x^2-8x, x0=1
y(x0)=1-8=-7
y'=2x-8
y'(x0)=2-8=-6
y=-7-6(x-1)
y=-7-6x+6
y=-1-6x
б) y=3x^2-8x-11, x0=-2
y(x0)=12+16-11=17
y'=6x-8
y'(x0)=-12-8=-20
y=17-20(x+2)
y=17-20x-40
y=-23-20x
в) y=11x-x^3, x0=-1
y(x0)=-11+1=-10
y'=11-3x^2
y'(x0)=11-3=8
y=-10+8(x+1)
y=-10+8x+8
y=-2+8x
г) y=x^4-5x^2, x0=3
y(x0)=81-45=36
y'=4x^3-10x
y'(x0)=108-30=78
y=36+78(x-3)
y=36+78x-234
y=-198+78x