The function is given by
[tex]f(x)=((5x)^3+5x)\cdot(x^{-4}+)+x+2)[/tex]Now the derivative of the function is
[tex]f^{\prime}(x)=((5x)^3+5x)\cdot\frac{d(x^{-4}+x+2)}{dx}+\frac{d((5x)^3+5x)}{dx}\cdot(x^{-4}+x+2)[/tex][tex]f^{\prime}(x)=((5x)^3+5x)\cdot(-4x^{-5}+1)+(375x^2+5)\cdot(x^{-4}+x+2)[/tex]The correct answer is b