A) \[{{y}^{2}}-2yz+{{z}^{2}}\]
B) \[{{y}^{2}}+2yz+{{z}^{2}}\]
C) \[{{y}^{2}}-2yz-{{z}^{2}}\]
D) \[-{{y}^{2}}+2yz-{{z}^{2}}\]
Correct Answer: B
Solution :
\[\begin{align} & 3{{y}^{2}}+5yz \\ & -2{{y}^{2}}-2yz-{{z}^{2}} \\ & \underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{\underset{{{y}^{2}}\,\,+\,\,2yz\,\,+\,\,{{z}^{2}}}{\mathop{\underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{-yz+2{{z}^{2}}}}\,}}\,}}\, \\ \end{align}\]
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