Answer
4
Work Step by Step
If $f(x) =x+x^3$, then $f'(x) = 1+3x^2$
$f'(1) = 1+3 \times (1) = 4$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 13 - Section 13.3 - Tangent Lines and Derivatives - 13.3 Exercises - Page 922: 22
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