If f(x)=4+7x+4x2\displaystyle {f{{\left({x}\right)}}}={4}+{\frac{{{7}}}{{{x}}}}+{\frac{{{4}}}{{{x}^{{2}}}}}, find f(x)\displaystyle {f}'{\left({x}\right)}.
 

Find f(4)\displaystyle {f}'{\left({4}\right)}.