Algebra 1

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: 82

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.
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