(3x+1)(x+2)
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Assuming you mean 14x2... (7x - 3)(2x + 5)
If that's +7x - 6, the answer is (x + 3)(3x - 2)
(2x + 1)(x + 3) are the factors.
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)
7x(3x3 - 2x2 + 5x + 1)