Factorise x ^ { 4 } + x ^ { 2 } y ^ { 2 } + y ^ { 4 } – InterviewSolution

1.	Factorise x ^ { 4 } + x ^ { 2 } y ^ { 2 } + y ^ { 4 }
Answer» x^4+2x^2y^2+y^4-x^2y^2=(x^2+y^2)-(xy)^2=(x^2+xy+y^2)(x^2-xy+y^2)

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