A) \[81{{x}^{2}}+49{{x}^{2}}{{y}^{2}}\]
B) \[81{{x}^{2}}-49{{x}^{2}}{{y}^{2}}\]
C) \[81{{x}^{2}}+49{{x}^{2}}{{y}^{2}}-126{{x}^{2}}y\]
D) \[81{{x}^{2}}+49{{x}^{2}}{{y}^{2}}-63{{x}^{2}}y\]
Correct Answer: C
Solution :
\[{{(9x-7xy)}^{2}}={{(9x)}^{2}}-2\times 9x\times 7xy+{{(7xy)}^{2}}\] \[=81{{x}^{2}}-126{{x}^{2}}y+49{{x}^{2}}{{y}^{2}}\]
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