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: 91

Answer

$x=5$ and $x=-\dfrac{3}{2}$

Work Step by Step

$\dfrac{10}{x}-\dfrac{12}{x-3}+4=0$ Multiply the whole equation by $x(x-3)$: $10(x-3)-12x+4x(x-3)=0$ $10x-30-12x+4x^{2}-12x=0$ Simplify: $4x^{2}-14x-30=0$ $2x^{2}-7x-15=0$ Solve by factoring: $(x-5)(2x+3)=0$ So, we get two solutions, which are: $x=5$ and $x=-\dfrac{3}{2}$
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