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Question

Factorise: x4+x2y2+y4

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Solution

x4+x2y2+y4
Adding and Subtracting x2y2 from the equation, we get:
x4+x2y2+y4+x2y2x2y2
= [(x2)2+2x2y2+(y2)2]x2y2
=(x2+y2)2x2y2

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