Enter your answer and show all the steps that you use to solve this problem and write your final answer in factored form in the space provided.
Simplify: (9x^3 + 2x^2 - 5x + 4) - (5x^3 - 7x + 4)
(9x^3 + 2x^2 - 5x + 4) - (5x^3 - 7x + 4)
= 9x^3 + 2x^2 - 5x + 4 - 5x^3 + 7x - 4
= 9x^3 - 5x^3 + 2x^2 - 5x + 7x + 4 - 4
= 4x^3 + 2x^2 + 2x
Therefore, the final answer in factored form is: 4x^3 + 2x^2 + 2x