4x2(4x3 + 3)
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4. 12x^2-64x-256=4(3x^2-16x-64)
(4x + 5)(3x - 7)
(2x - 5)(2x - 3)
Greatest common factor of 16x and 36x is 4x.
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