Answer
$f(x)=x^2,a=-1,b=1$
Work Step by Step
A counterexample is $f(x)=x^2,a=-1,b=1$, where $f(1)=1^2=1=f(-1)=(-1)^2=1$ but $-1\ne1$.
Elementary Linear Algebra 7th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
1-13311-087-8
ISBN 13:
978-1-13311-087-3
Appendix - Mathematical Induction and Other Forms of Proofs - Exercises - Page A6: 26
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