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Question
Factorise the following:
y4 + y2 + 1
Sum
Solution
y4 + y2 + 1
= y4 + 2y2 + 1 - y2
= (y2 + 1)2 - y2
= (y2 + 1 + y)(y2 + 1 - y).
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Method of Factorisation : Difference of Two Squares
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