Answer
$x=9, x=-9$
Work Step by Step
$\frac {x+1}{5}=\frac {16}{x-1}$
Cross Multiply...
$(x+1)(x-1)=5(16)$
Simplify by multiplying
$x^{2}+1x-1x-1=80$
$x^{2}-1=80$
Add 1 to both sides...
$x^{2}=81$
Square root both sides...
$x=9, x=-9$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 5 - Test - Page 275: 2b
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