The expression does not have any real binomial factors. x is a monomial factor, and the other two involve complex numbers.
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(7x + 4)(49x^2 - 28x + 16)
4x(4x^2 - 6x + 7)
(4x + 7)(16x2 - 28x + 49)
12x2 - 28x - 15= 12x2 - 18x - 10x - 15= 6x(2x - 3) - 5(2x - 3)= (6x - 5)(2x - 3)
9x2 - 28x + 20 = 9x2 - 18x - 10x + 20 = 9x(x - 2) - 10(x - 2) = (9x - 10)*(x - 2)