What should be added to\[{{x}^{2}}+xy+{{y}^{2}}\]to obtain\[2{{x}^{2}}+3xy\]?

What should be added to\[{{x}^{2}}+xy+{{y}^{2}}\]to obtain\[2{{x}^{2}}

1.	What should be added to\[{{x}^{2}}+xy+{{y}^{2}}\]to obtain\[2{{x}^{2}}+3xy\]?
A.	\[-{{x}^{2}}-2xy+{{y}^{2}}\]
B.	\[{{x}^{2}}-2xy-{{y}^{2}}\]
C.	\[{{x}^{2}}+2xy-{{y}^{2}}\]
D.	\[{{x}^{2}}+2xy+{{y}^{2}}\]
Answer» D. \[{{x}^{2}}+2xy+{{y}^{2}}\]

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What should be added to\[{{x}^{2}}+xy+{{y}^{2}}\]to obtain\[2{{x}^{2}}+3xy\]?

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