I'm assuming this is x^2 + 3x - 4 and x(x^2 + 3x - 2)
1.) First distribute x(x^2 + 3x - 2) to get x^3 + 3x^2 - 2x.
2.) Because you are subtracting all the terms from x^3 + 3x^2 - 2x, it's the same thing as distributing -1 to x^2 + 3x - 4 and then adding it to x^3 + 3x^2 - 2x.
Assuming that the problem is (x^2+3x-4) - x(x^2+3x-2) then this would be simple.. simplifying XD here is the work for you: (x^2+3x-4) - x(x^2+3x-2) (x^2+3x-4) - (x^3+3x^2-2x) Final Answer: -x^3-2x^2+5x-4