Factorise: 54x2 – 96y2
We have 54x2 – 96y2 = 6[9x2 - 16y2]
                            = 6[(3x)2 - (4y)2]
                            = 6 [(3x + 4y)(3x - 4y)] [Using a2 - b2 = (a + b)(a - b)]
Thus,   54x2 - 96y2 = 6 (3x + 4y)(3x - 4y)
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