Find the value of the missing coefficient in the factored form of $\displaystyle{27}{{f}}^{{3}}+{125}{{g}}^{{3}}\usepackage{cmbright}\Huge\$ .

$\displaystyle{27}{{f}}^{{3}}+{125}{{g}}^{{3}}={\left({3}{f{+}}{5}{g}\right)}{\left({9}{{f}}^{{2}}-?{f{{g{+}}}}{25}{{g}}^{{2}}\right)}\usepackage{cmbright}\Huge\$

The value of $\displaystyle?=\usepackage{cmbright}\Huge\$ _____.