Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 4 - Polynomials - 4.5 Multiplication of Polynomials - 4.5 Exercise Set: 43

Answer

$a^2-1.3a+0.42$

Work Step by Step

Using $(a+b)(c+d)=ac+ad+bc+bd$ or the product of $2$ binomials, the given expression, $ (a-0.6)(a-0.7) $, is equivalent to \begin{array}{l}\require{cancel} a(a)+a(-0.7)-0.6(a)-0.6(-0.7) \\\\= a^2-0.7a-0.6a+0.42 \\\\= a^2-1.3a+0.42 .\end{array}
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