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Factorize:
$x^4 + x^2y^2 + y^4$
Given :
$x^4 + x^2y^2 + y^4$
To do :
We have to factorize the given expression.
Solution :
$x^4 + x^2y^2 + y^4 = (x^2)^2 + x^2y2 + (y^2)^2 + x^2y^2 - x^2y^2$ (Adding and subtracting $x^2y^2$)
$=(x^2)^2 + 2x^2y2 + (y^2)^2 - x^2y^2$
$= (x^2 + y^2)^2 - (xy)^2$
$= (x^2 + y^2 + xy) (x^2 + y^2 - xy)$
$= (x^2 + xy + y^2) (x^2 - xy + y^2)$
Hence, $x^4 + x^2y^2 + y^4 = (x^2 + xy + y^2) (x^2 - xy + y^2)$.
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