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: 9

Answer

(a) Sum: $4$ (b) Difference: $2$ (c) Product: $3$

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. (5) The sum of two negative numbers is negative. (6) The sum of two positive numbers is positive. (7) The sum of two numbers with different signs is equal to the difference of their absolute values. The sum will have the same sign as the number with the bigger absolute value. Thus, the sum, difference, and product of the given expressions are: (a) Sum: $(+3) + (+1) = +4=4$ (b) Difference: $(+3) - (+1) = +2=2$ (c) Product: $(+3)(+1) = +3=3$
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