Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.3 - Algebraic Expressions - 1.3 Exercises - Page 35: 138

Answer

(a) $1055$ (b) $484$ (c) $20300$

Work Step by Step

(a) $528^{2}-527^{2}=(528-527)\times(528+527)=1\times1055=1055$ (b) $122^{2}-120^{2}=(122-120)\times(122+120)=2\times242=484$ (c) $1020^{2}-1010^{2}=(1020-1010)\times(1020+1010)=10\times2030=20300$
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