Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Prerequisites - P.5 - Rational Expressions - Exercises - Page 48: 12


All real numbers except $x=2$ and $x=-5$

Work Step by Step

$\frac{x^2-1}{x^2+3x-10}$ The denominator can not be equal to zero: $x^2+3x-10\ne0$ $x^2+5x-2x-10\ne0$ $x(x+5)-2(x+5)\ne0$ $(x-2)(x+5)\ne0$ $x\ne2$ and $x\ne-5$
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