Answer
Irrational Numbers
Work Step by Step
An irrational number is any number that cannot be represented by the quotient of two integers.
The number $\sqrt {21}$ cannot be expressed as the quotient of two integers. Therefore, it is irrational.
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Mixed Review - Page 36: 82
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