Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 11 - Section 11.3 - Solving Equations by Using Quadratic Methods - Exercise Set - Page 787: 31

Answer

$x=\frac{-9±\sqrt {201}}{6}$

Work Step by Step

$\frac {2x}{x-2} + \frac{x}{x+3} = \frac{-5}{x+3}$ $(x-2)(x+3)*\frac {2x}{x-2} + (x-2)(x+3)*\frac{x}{x+3} = (x-2)(x+3)*\frac{-5}{x+3}$ $(x+3)(2x)+(x-2)(x)=(x-2)(-5)$ $2x^2+6x+x^2-2x=-5x+10$ $3x^2+4x=-5x+10$ $3x^2+9x-10=0$ $x=(-b±\sqrt {b^2-4ac})/2a$ $x=(-9±\sqrt {9^2-4*3*-10})/2*3$ $x=(-9±\sqrt {81+120})/6$ $x=(-9±\sqrt {201})/6$ Neither answer for $x$ would make the denominators negative, so both answers are valid.
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