Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 8 - Cumulative Review Exercises - Page 621: 15

Answer

$$8x^3 - 27$$

Work Step by Step

To multiply a binomial with a trinomial, we will use distributive property to multiply each term of the binomial with each term in the trinomial. $$(2x)(4x^2) + (2x)(6x) + (2x)(9) + (-3)(4x^2) + (-3)(6x) + (-3)(9)$$ Multiply the terms: $$8x^3 + 12x^2 + 18x - 12x^2 - 18x - 27$$ Group like terms: $$8x^3 + (12x^2 - 12x^2) + (18x - 18x) - 27$$ Combine like terms: $$8x^3 - 27$$
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