Question

F(x)=9x^3+2x^2-5x+4 and g(x)=5x^3-7x+4. What is f(x)-g(x)? Show all of your steps.

I honestly have no idea how to do this. Can someone please explain what I have to do?
Is this right? 4x^3 + 2x^2 + 2x 

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