F'(x) if f( x) = 8/5x^4 ?

please help i don't understand this problem

1 Answer
Oct 2, 2017

#f(x)=8/(5x^4)=8/5x^-4#
After differentiating,
#f^'(x)=8/5×-4×x^(-4-1#[using the rule of differentiating of #x^n# #=>d/(dx)x^n=nx^(n-1#
So we get ,
#f^'(x)=-32/5×x^-5=-32/(5x^5#
Hope it helps...
Thank you....