Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning
ISBN 10: 0-49539-132-8
ISBN 13: 978-0-49539-132-6

Chapter 1 - Speaking Mathematically - Exercise Set 1.1 - Page 5: 1


a. $x^{2} = -1$ b. a real number $x$

Work Step by Step

Remember not to introduce variables unnecessarily. If the question begins with a reference to some $x$, the question should end by referring to $x$ again. Note that, in this case, no such real $x$ exists.
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