Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 1 - Section 1.2 - Basics of Functions and Their Graphs - Concept and Vocabulary Check - Page 175: 6

Answer

$x$, $x+6$

Work Step by Step

For a given function $f(x)=x^2-5x+4$, to evaluate its value at $x=u$, we can replace $x$ with $u$, where $u$ can be an expression such as $u=x+6$ to get $f(u)=u^2-5u+4$ or $f(x+6)=(x+6)^2-5(x+6)+4$. Thus the answers to this question are $x$ and $x+6$.
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