SOLUTION: f(x)=9x^3+2x^2-5x+4 and g(x)=5x^3-7x+4. What is f(x)-g(x)? I've been on this question for a while now and I'm really struggling. Help?

Algebra ->  Functions -> SOLUTION: f(x)=9x^3+2x^2-5x+4 and g(x)=5x^3-7x+4. What is f(x)-g(x)? I've been on this question for a while now and I'm really struggling. Help?      Log On


   

Question 997545: f(x)=9x^3+2x^2-5x+4 and g(x)=5x^3-7x+4. What is f(x)-g(x)?
I've been on this question for a while now and I'm really struggling. Help?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
How about substitute according to the indicated functions' definitions!!

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!
f(x)=9x^3+2x^2-5x+4 and g(x)=5x^3-7x+4. What is f(x)-g(x)?
I've been on this question for a while now and I'm really struggling. Help?
f%28x%29+=+9x%5E3+%2B+2x%5E2+-+5x+%2B+4 and g%28x%29+=+5x%5E3+-+7x+%2B+4

f(x) =    9x3 + 2x2 - 5x + 4 --------->    9x3 + 2x2 - 5x + 4

g(x) = - (5x3       - 7x + 4) -------->  - 5x3       + 7x - 4          

                                           4x3 + 2x2 + 2x -------> highlight_green%28Final_answer%29