Factorise :
54a2b2 - 6
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= 6(9a2b2 - 1)
= 6((3ab)2 - (1)2)
Using the formula
[∵ (x2 - y2) = (x + y)(x - y)]
= 6(3ab - 1)(3ab + 1)
Hence, 54a2b2 - 6 = 6(3ab - 1)(3ab + 1)
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