$\displaystyle{f{{\left({x}\right)}}}={8}{{x}}^{{3}}-{7}{x}+{1}\usepackage{cmbright}\Huge\$

$\displaystyle{g{{\left({x}\right)}}}={8}{{x}}^{{3}}-{8}{{x}}^{{2}}-{8}{x}\usepackage{cmbright}\Huge\$

$\displaystyle{h}{\left({x}\right)}=-{6}{{x}}^{{2}}+{9}{x}+{4}\usepackage{cmbright}\Huge\$

Which function difference is equivalent to $\displaystyle-{8}{{x}}^{{3}}-{6}{{x}}^{{2}}+{16}{x}+{3}\usepackage{cmbright}\Huge\$ ?