Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 11 - Rational Expressions and Functions - 11-1 Simplifying Rational Expressions - Lesson Check - Page 655: 5


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We sometimes need to exclude values because these inputs would not be valid in the original expression. For instance, if x+5 was in the denominator of the original expression, we could not consider x=-5, for if x=-5, then the denominator of the fraction would be 0, which is not allowed.
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