Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 8 - Polynomials and Factoring - 8-2 Multiplying and Factoring - Standardized Test Prep - Page 484: 48



Work Step by Step

To find the answer you could find the GCF and factor the expression, but in a standardized test you should try to solve each question as quickly as possible. Use mental math to find the answer more quickly. You know that $ax(3x^2)$ must equal $9x^3$, so $a\times3=9$. a must be 3. You also know that $ax(5)$ must be 15. In this equation, a must also be 3. This validates the result.
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