If that's +7x - 6, the answer is (x + 3)(3x - 2)
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(3x+1)(x+2)
49x2 - 84x + 36 = (7x - 6)(7x - 6) or (7x - 6)2
The sum of the coefficients is 3 - 7 + 4 = 0 so (x - 1) is a factor. Thus, 3x2 - 7x + 4 = 3x2 - 3x - 4x + 4 = 3x(x - 1) - 4(x - 1) = (3x - 4)(x - 1)
3(7x-6)
While it is possible to factor 3x2 from both of these and get 3x2(4 - 1), it's a lot easier to subtract 3x2 from 12x2 and get 9x2