College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 1, Equations and Graphs - Section 1.6 - Solving Other Types of Equations - 1.6 Exercises - Page 138: 28

Answer

$ x=-\frac{3}{2}$ or $x=5$

Work Step by Step

$$\frac{10}{x}-\frac{12}{x-3}+4=0$$, First multiply both sides by $x(x-3)$: $x(x-3)\frac{10}{x}-x(x-3)\frac{12}{x-3}+x(x-3)4=x(x-3)0$, $10(x-3)-12x+4x(x-3)=0$, And then distribute: $10(x-3)-12x+4x(x-3)=0$, $10x-30-12x+4x^2-12x=0$, And then combine like terms: $10x-30-12x+4x^2-12x=0$, $4x^2+10x-12x-12x-30=0$, $4x^2-14x-30=0$, And then factor out and solve for trinomial: $4x^2-20x+6x-30=0$, $4x(x-5)+6(x-5)=0$, $(4x+6)(x-5)=0$, either $4x+6=0, x=-\frac{3}{2}$ or $x-5=0, x=5$
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