Question

f(x)=6(x^4-x^3)+2x   naydite f ' (-1) ???

Answer 1

f(x)=6(x^4-x^3)+2x
f(x)=6x^4-6x^3+2x
f'(x)=24x^3-18x^2+2
f'(-1)=-24-18+2=-24-16=-40 

Answer 2

$f'(x)=(6(x^4-x^3)+2x)'=(6x^4-6x^3+2x)'= \ =4*6x^3-6*3x^2+2=24x^3-18x^2+2 \ \ f'(-1)=24*(-1)^3-18*(-1)^2+2=-24-18+2=-40$

 

Ответ: -40