Answer
Not linear.
Work Step by Step
We are given:
$f(x)=(x+1)^{2}$
$f(x)=x^{2}+2x+1$
Since the function does not have the form $f(x)=ax+b$, it is not linear.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 2, Functions - Section 2.5 - Linear Functions and Models - 2.5 Exercises - Page 231: 13
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