Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 4 - Section 4.4 - Multiplying Polynomials - 4.4 Exercises - Page 305: 72



Work Step by Step

Using $(a+b)(c+d)=ac+ad+bc+bd$ or the FOIL Method, the product of the binomials in the given expression, $ (0.1y+2.1)(0.5y-0.4) ,$ is \begin{array}{l}\require{cancel} 0.1y(0.5y)+0.1y(-0.4)+2.1(0.5y)+2.1(-0.4) \\\\= 0.05y^2-0.04y+1.05y-0.84 \\\\= 0.05y^2+1.01y-0.84 .\end{array}
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