question_answer

Multiply: \[(3{{x}^{2}}+{{y}^{2}})\]and \[({{x}^{2}}+2{{y}^{2}})\]

A) \[3{{x}^{3}}+7{{x}^{4}}+2{{x}^{2}}\]

B) \[2{{x}^{4}}+4x{{y}^{3}}-2{{y}^{4}}\]

C) \[3{{x}^{4}}+7{{x}^{2}}{{y}^{2}}+2{{y}^{4}}\]

D) \[4{{x}^{4}}+7xy+3{{y}^{2}}\]

E) None of these