Answer:
\[~{{\left( 9x7xy \right)}^{2}}\] Using \[{{\left( ab \right)}^{2\text{ }}}=\text{ }{{a}^{2}}+{{b}^{2}}2ab\] \[{{\left( 9x \right)}^{2}}+{{\left( 7xy \right)}^{2}}2\times 9x\times 7xy\] \[81{{x}^{2}}+49{{x}^{2}}{{y}^{2}}126{{x}^{2}}y\]
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