Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 9 - Roots and Radicals - 9.4 - Products and Quotients Involving Radicals - Problem Set 9.4: 66

Answer

$\dfrac{y+6\sqrt{y}}{y-36}$

Work Step by Step

Multiplying by the conjugate of the denominator and using $(a+b)(a-b)=a^2-b^2,$ the given expression, $ \dfrac{\sqrt{y}}{\sqrt{y}-6} ,$ simplifies to \begin{array}{l}\require{cancel} \dfrac{\sqrt{y}}{\sqrt{y}-6}\cdot\dfrac{\sqrt{y}+6}{\sqrt{y}+6} \\\\= \dfrac{\sqrt{y}(\sqrt{y}+6)}{(\sqrt{y})^2-(6)^2} \\\\= \dfrac{y+6\sqrt{y}}{y-36} .\end{array}
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