factorise 216x^2-729y^2
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216x^2 - 729y^2
=6(36x^2 - 121y^2)
=6[(6x)^2 - (11y)^2]
=6[(6x+11y)(6x-11y)]
=6(36x^2 - 121y^2)
=6[(6x)^2 - (11y)^2]
=6[(6x+11y)(6x-11y)]
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