Answer
7
Work Step by Step
$f'(x)=\lim\limits_{h \to 0}\frac{f(x+h)-f(x)}{h}=\lim\limits_{h \to 0}\frac{[7(x+h)-9]-(7x-9)}{h}$
$=\lim\limits_{h \to 0}\frac{7x+7h-9-7x+9}{h}=\lim\limits_{h \to 0}(7)=7$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 3 - Differentiation - 3.1 Definition of the Derivative - Exercises - Page 103: 17
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