What should be added to a^{2}+2 a b+b^{2} \text { to get } 4 a b+b^{2} – InterviewSolution

1.	What should be added to a^{2}+2 a b+b^{2} \text { to get } 4 a b+b^{2} ?
Answer» required polynomial=4ab+b^2-a^2-2ab-b^2=2ab-a^2

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