Answer
See below.
Work Step by Step
$f(g(x))=f(2x-7)=3(2x-7)^{-1}=\frac{3}{2x-7}$
The denominator of this function cannot be $0$, thus $x\ne3.5$, thus the domain is all real numbers apart from $x=3.5$.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 6 Rational Exponents and Radical Functions - 6.3 Perform Function Operations and Composition - 6.3 Exercises - Skill Practice - Page 432: 28
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