Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 3 - Section 3.2 - Polynomial Functions and Their Graphs - 3.2 Exercises - Page 266: 30

Answer

From the far left to the far right, the graph - falls from $+\infty$, the upper far left, - touches the x axis at $(-1,0)$ where it - turns up to rise through $(0,9)$, keeps rising, - turns and touches the x axis at $(3,0)$, where it turns back up, - and continues to rise to the far right.

Work Step by Step

End behavior: When $ x\rightarrow-\infty$ , both squared factors are positive, $P(x)$ is positive to the far left. When $ x\rightarrow+\infty$ , , both squared factors are positive, $P(x)$ is positive to the far right. Intercepts: $ x+2=0,\quad x-3=0$ x-intercepts: $x=-1$, double (graph touches x and turns)$.\\\\$ $x=3$, double (graph touches x and turns)$.\\\\$ y-intercept: $P(0)=9$ $P(1)=16$, so the graph rises through $(0,9)$ From the far left to the far right, the graph - falls from $+\infty$, the upper far left, - touches the x axis at $(-1,0)$ where it - turns up to rise through $(0,9)$, keeps rising, - turns and touches the x axis at $(3,0)$, where it turns back up, - and continues to rise to the far right.
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