question_answer

What should be taken away from \[3{{x}^{2}}-4{{y}^{2}}+5xy+20\]to get \[-{{x}^{2}}-{{y}^{2}}+6xy-20?\]

A) \[2{{x}^{2}}-5{{y}^{2}}+11xy+40\]           

B)  \[4{{x}^{2}}-3{{y}^{2}}-xy+40\]

C) \[2{{x}^{2}}-3{{y}^{2}}-xy+20\]

D) \[4{{x}^{2}}-3{{y}^{2}}-11xy-40\]