Elementary Algebra

by Kaufmann, Jerome; Schwitters, Karen;

Published by Cengage Learning

ISBN 10: 1285194055

ISBN 13: 978-1-28519-405-9

Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.1 - Numerical and Algebraic Expressions - Problem Set 1.1 - Page 7: 50

Answer

$= 462$

Work Step by Step

We plug in the values for the variables that are given in the problem: $(3a + b)(7a-2b)$ $= (3(5)+7)(7(5)-2(7))$ $= (15 + 7)(35 - 14)$ $= 22(21)$ $= 462$

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