Let
f(x)=(9x2+8)3(5x2+5)14\displaystyle {f{{\left({x}\right)}}}={\left(-{9}{x}^{{2}}+{8}\right)}^{{{3}}}{\left(-{5}{x}^{{2}}+{5}\right)}^{{{14}}}

f(x)=\displaystyle {f}'{\left({x}\right)}=