Answer
Domain:$\quad (-\infty,7)$
Work Step by Step
Logarithmic functions are defined for positive arguments only.
The argument here is $7-x $, and it must be positive, so we solve
$7-x \gt 0$
$7 \gt x $
Domain:$\quad (-\infty,7)$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 3 - Section 3.2 - Exponential Functions - Exercise Set - Page 464: 78
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