Introductory Algebra for College Students (7th Edition)

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

Chapter 9 - Cumulative Review Exercises - Page 686: 15


$$21x^2 - 23x - 20$$

Work Step by Step

To simplify this expression, we need to use FOIL to multiply the two binomials. We first multiply the first terms, then the outer terms, then the inner terms, and, finally, the last terms: $$7x(3x) + (7x)(-5) + (4)(3x) + (4)(-5)$$ Multiply the terms to simplify: $$21x^2 - 35x + 12x - 20$$ Group like terms: $$21x^2 - 23x - 20$$
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