Answer
$$x^2+6x-9$$
Work Step by Step
We know the following:
$$ (f-g)(x)=f(x)-g(x)$$
Thus, plugging in $f(x)$ and $g(x)$ and combining like terms, we find:
$$ x^2+3x-\left(9-3x\right)\\ x^2+3x-9+3x\\ x^2+6x-9$$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 1-9 - Cumulative Review - Page 625: 25
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