College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 1, Equations and Graphs - Chapter 1 Review - Exercises: 99

Answer

$(-\infty,\ 0] \cup\ [4,\ \infty)$

Work Step by Step

We see from the graph that the equation $y=x^{2}-4x$ lies above (i.e is greater than) the $x$-axis for $x\lt 0$ and for $x\gt 4$, i.e. $(-\infty,\ 0] \cup\ [4,\ \infty)$ .
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