College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 3 - Section 3.4 - Library of Functions; Piecewise-defined Function - 3.4 Assess Your Understanding - Page 245: 36

Answer

$a.\quad [-3,\infty)$ $b.\quad (-2.5,0)$, ($0,-3$) $c.\quad $see image $d.\quad (-\infty,5)$ $e.\quad $Not continuous (jump at $x=0$)

Work Step by Step

It's best to graph the function first. For $x\in[-3,0)$ the graph is the line segment on the line $y=2x+5$, containing points $(-3,-1)$ and $(-1,3)$ The right end of the line segment is marked with an open dot at $(0,5)$. At $x=0$, the point ($0,-3$) is on the graph. (A jump on the graph - not continuous) For $x\in(0,\infty)$ the graph is the ray $y=-5x$, with the point $(0,0)$ excluded (open dot) passing through the point $(1,-5)$ Domain: $[-3,\infty)$ Range : $(-\infty,5)$ x-intercepts:$\quad (-2.5,0)$. y intercepts:$\quad$ ($0,-3$) There is a jump on the graph at x=$0$ - not continuous
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