Answer
$-6$
Work Step by Step
Take the derivative of $f(x)$
$f'(x)=-2x$
Plug in the x value of the given coordinate to find the slope:
$f'(3)=-2(3)=-6$
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 2 - Differentiation - 2.1 Exercises - Page 103: 8
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