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factorise 64acube+27pcube

64a3 + 27b3 = (4a)3 +  (3b)3
                    = (4a + 3b) [(4a)2  – (4a)(3b) + (3b)2 ]
                    = (4a + 3b) (16a2  – 12ab + 9b2 )


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