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factor 4x^4-2x^3y-3xy^3-9y^4
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\[4x^{4}-2x^{3}y-3xy^{3}-9y^{4}\]rearranging it\[4x^{4}-9y^{4}-2x^{3}y-3xy^{3}\]group method:\[\left(2x^{2}-3y^{2}\right)^{2}-xy\left(2x^{2}-3y^{2}\right)\]factor out 2x^2-3y^2 from both:\[\left(2x^{2}-3y^{2}\right)\left[\left(2x^{2}-3y^{2}\right)-xy\right]\]
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