A) \[-12{{x}^{2}}{{y}^{2}}\]
B) \[12{{x}^{2}}{{y}^{2}}\]
C) \[-12xy\]
D) \[12xy\]
Correct Answer: B
Solution :
\[\begin{align} & {{x}^{4}}+8{{x}^{2}}{{y}^{2}}+{{y}^{4}} \\ & (-)\,\,{{x}^{4}}-4{{x}^{2}}{{y}^{2}}+{{y}^{4}} \\ & \underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{\underset{12\,{{x}^{2}}\,{{y}^{2}}}{\mathop{\underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{-\,\,\,\,\,\,\,\,+\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,-}}\,}}\,}}\, \\ \end{align}\]
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