Factor it as follows 2x^3 - 3x^2 - 50x + 75 = apply grouping first = (2x^3 - 3x^2) - (50x - 75) = = x^2*(2x-3) - 25*(2x-3) = (x^2-25)*(2x-3) = (x+5)*(x-5)*(2x-3).