question_answer

Simplify : \[{{x}^{2}}+3{{x}^{2}}+{{y}^{2}}-3{{x}^{2}}\]

A)  \[2{{x}^{2}}+3{{y}^{2}}\]             

B)  \[{{x}^{2}}+{{y}^{2}}\] 

C)  \[2{{x}^{2}}\]                                   

D)  \[3{{y}^{2}}\]

E)  None of these