Question

дана функция f(x)=5x^8-8x^3. найти f'(-1)

Answer 1

f(x)=5(x^8)-8(x^3)
f'(x)=5(x^9/9)-8(x^4/4)=(5x^9)/9 - 2x^4
f'(-1)=(5*1^-9)/9 - 2*1^4=-(5/9)-2=-5-18/9=-23/9