Precalculus: Mathematics for Calculus, 7th Edition

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

Chapter 1 - Section 1.1 - Real Numbers - 1.1 Exercises: 84

Answer

a) positive b) positive c) positive d) positive

Work Step by Step

$A\gt0$ = positive (+) $B\lt0$=negative (-) $C\lt0$=negative (-) and $(+) \times(+)$ = + $(-) \times(+)$= - $(-) \times(-)$= + so: a) -B=$(-)\times(-)$ = + b) A + BC= (+) + $(-)\times(-)$ =$ (+)\times(+)\times(+)$ = + c) C - A= (-) - (+) = (-)[ $(-)\times(+)$]=$(-)\times(-)$ = (+) d) A$B^{2}$ = $(+)\times[(-)^{2}]$= $(+)\times(+)$= (+)
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