factorise:- 12x square-7x-1
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12x2 - 7x + 1
= we can find two numbers such that pq = 12 x 1 = 12 and p + q = -7
%D Here, 12x2 - 7x + 1 = 12x2 - 4x - 3x + 1
= 4 x ( 3x - 1) - 1 ( 3x - 1)
= ( 3x - 1) ( 4x - 1)
Maybe it help you
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