9x^4+2x^2y^2+y^4

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9x^4+2x^2y^2+y^4
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9x^4+2x^2y^2+y^4
9x^4+2x^2y^2+y^4

9x^4+2x^2y^2+y^4
9x^4+2x^2y^2+y^4
=9x^4+6x^2y^2+y^4-4x^2y^2
=(3x^2+y^2)^2-4x^2y^2
=(3x^2+y^2+2xy)(3x^2+y^2-2xy)