Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.5 - Equations - 1.5 Exercises - Page 57: 126

Answer

$\sqrt x-a\sqrt[3] x+b\sqrt[6] x-ab=0$ If $a=b=0$, then $x=0$ If $a>0$, then $x=a^{6}$ If $b>0$, then $x=-b^{3}$

Work Step by Step

$\sqrt x-a\sqrt[3] x+b\sqrt[6] x-ab=0$ $(\sqrt x+b\sqrt[6]x)-(a\sqrt[3] x+ab)=0$ $\sqrt[6]x(\sqrt[3] x+b)-a(\sqrt[3] x+b)=0$ $(\sqrt[3] x+b)\times(\sqrt[6]x-a)=0$ $(\sqrt[3] x+b)=0$ or $(\sqrt[6]x-a)=0$ With $(\sqrt[3] x+b)=0$: If $b=0$, then $x=0$; If $b>0$, then $x=-b^{3}$. With $(\sqrt[6]x-a)=0$; If $a=0$, then $x=0$, If $a>0$, then $x=a^{6}$
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