Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 2 - Section 2.3 - Multiplication and Division of Signed Numbers - Signed Numbers Drill 3: 8

Answer

(a) Sum: $12$ (b) Difference: $-4$ (c) Product: $32$

Work Step by Step

RECALL: (1) For any real number $a$, $a + 0 = a$. (2) For any real number $a$, $a(0) = 0$. (3) $a-b=a+(-b)$. (4) The product of two integers with the same sign is positive. The sum, difference, and product of the given expressions are: (a) Sum: $(+4) + (+8) = +12=12$ (b) Difference: $(+4) - (+8) = -4$ (c) Product: $(+4)(+8) = +32=32$
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