Answer
Because we do not know what the function is.
Work Step by Step
We do not know the value of $f(3)$ even if $f(2)$ and $f(4)$ are given, $f(x) $ can still be a lot of functions.
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 1 - Section 1.1 - Functions from the Numerical, Algebraic, and Graphical Viewpoints - Exercises - Page 56: 68
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