## Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning

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

#### Answer

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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