Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 5 - Section 5.1 - Ratios, Rates, and Proportions - Exercises - Page 228: 10a


$x=-7$ or $4$

Work Step by Step

$\frac{x+1}{3} = \frac{10}{x+2}$ $(x+1)(x+2) = 10\times3$ $x^{2}+3x+2 = 30$ $x^{2}+3x-28 = 0$ $(x+7)(x-4)=0$ $x=-7$ or $4$
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