15x^2+14x-8 15*-8= -120 (-6+20= 14) 15x^2-6x+20x-8 3x(3*5x^2/3x -2*3x/3x)+ 2^2(2^2*5x/2^2 - 2^3/2^2) (5x-2)(3x+2^2) (5x-2)(3x+4)
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