College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 1 - Equations and Inequalities - Exercise Set 1.6 - Page 181: 133

Answer

$x=\frac{1}{2}$

Work Step by Step

$\sqrt (6x-2) = \sqrt (2x+3)- \sqrt (4x-1)$ Squaring on both sides. $(\sqrt (6x-2) )^{2}= (\sqrt (2x+3)- \sqrt (4x-1))^{2}$ Using $(A-B)^{2}=A^{2}+B^{2}-2AB$ $(6x-2) = (2x+3) + (4x-1) -2 (\sqrt (2x+3)\sqrt (4x-1))$ $6x-2 = 6x+2 -2 (\sqrt (2x+3)\sqrt (4x-1))$ $2 (\sqrt (2x+3)\sqrt (4x-1)) = 6x+2 -6x+2$ $2 (\sqrt (2x+3)\sqrt (4x-1)) = 4$ $ \sqrt (2x+3)\sqrt (4x-1) = 2$ Again, squaring on both sides, $ (\sqrt (2x+3)\sqrt (4x-1))^{2} = 2^{2}$ $(2x+3)(4x-1) = 4$ $8x^{2}+12x-2x-3-4=0$ $8x^{2}+10x-3-4=0$ $8x^{2}+10x-7=0$ By factoring, $(4x+7)(2x-1)=0$ $4x+7=0$ or $2x-1=0$ $4x=-7$ or $2x=1$ $x=-\frac{7}{4}$ or $x = \frac{1}{2}$ By checking the proposed solutions in the given equation $x=-\frac{7}{4}$ is not a solution. It is an extraneous solution and $x = \frac{1}{2}$ is the only solution.
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