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

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

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

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