a ^ { 4 } + 2 a ^ { 2 } b ^ { 2 } + b ^ { 4 } – InterviewSolution

1.	a ^ { 4 } + 2 a ^ { 2 } b ^ { 2 } + b ^ { 4 }
Answer» a^4+2a^2b^2+b^4=(a^2)^2+2(a^2b^2)+(b^2)^2=(a^2+b^2)^2

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