Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Appendix A - Exercise Set: 28



Work Step by Step

$(5x^{2}+x+9) - (2x^{2}-9)=5x^{2}+x+9 - 2x^{2} - (-9)$ $=3x^{2}+x+9 +9=3x^{2}+x+18$
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