2x^4+7x^3-2x^2-13x+6=2x^4+7x^3+3x^2-5x^2-13x+6=x^2(2x+1)(x+3)-(5x-2)(x+3)=(x+3)[x^2(2x+1)-(5x-2)] =(x+3)(2x^3+x^2-2x-3x+2)=(x+3)[(2x^3-2x)+(x^2-3x+2)]=(x+3)[2x(x^2-1)+(x-2)(x-1)]=(x+3)[2x(x+1)(x-1)+(x...
