Introductory Algebra for College Students (7th Edition)

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

Chapter 5 - Section 5.3 - Special Products - Exercise Set - Page 367: 17



Work Step by Step

Using $(a+b)(c+d)=ab+ad+bc+bd$ or the FOIL Method, the product of the given expression, $ (5x^2-4)(3x^2-7) ,$ is \begin{array}{l}\require{cancel} 5x^2(3x^2)+5x^2(-7)-4(3x^2)-4(-7) \\\\= 15x^4-35x^2-12x^2+28 \\\\= 15x^4-47x^2+28 .\end{array}
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