Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Section P.7 - Equations - Exercise Set - Page 108: 146

Answer

Any value of x that cause a zero in any of the denominators must be excluded, because the equation is not defined for these values. The LHS has denominators (x+5) and (x-2), so we must exclude $ x=-5$ and $ x=2$. The RHS has $ x^{2}+3x-6$ as a denominator. Find zeros with the quadratic formula: $ x=\displaystyle \frac{-3\pm\sqrt{9-4(1)(-6)}}{2(1)}= \displaystyle \frac{-3\pm\sqrt{33}}{2}$ So, the numbers $ x= \displaystyle \frac{-3-\sqrt{33}}{2}$ and $ x= \displaystyle \frac{-3+\sqrt{33}}{2}$ are also excluded.

Work Step by Step

Given above.
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