Answer
$3x^{2}+x+18$
Work Step by Step
$(5x^{2}+x+9) - (2x^{2}-9)=5x^{2}+x+9 - 2x^{2} - (-9)$
$=3x^{2}+x+9 +9=3x^{2}+x+18$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Appendix A - Exercise Set - Page 975: 28
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