Answer
$ba$, commutative property of multiplication
Work Step by Step
$ab=a \cdot b = b \cdot a = ba$
To prove, $ab=ba$, divide both sides by $a$ or $b$ and the equations will become equal.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Section P.2 - Real Numbers - P.2 Exercises - Page 15: 2
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