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: 24

Answer

From the far left to the far right, the graph - rises from $-\infty$, the lower far left, - crosses the x axis at $(0,0)$, rising, - turns and touches the x axis at $(5,0)$ where it - turns back up to rise to $+\infty$ the upper far right

Work Step by Step

$P(x)=\displaystyle \frac{1}{5}x(x-5)^{2}$ End behavior: When $ x\rightarrow-\infty$ , $\displaystyle \frac{1}{5}x$ is negative, $(x-2)^{2}$ is positive, $P(x)$ is negative to the far left. When $ x\rightarrow+\infty$ , $\displaystyle \frac{1}{5}x$ is positive, $(x-2)^{2}$ is positive, $P(x)$ is positive to the far right. Intercepts: $ x=0,\quad x-5=0$ x-intercepts: $x=0$, single (graph crosses x$)$ $x=5$, double (graph touvhes x and turns)$.\\\\$ y-intercept: $(0,0)$ From the far left to the far right, the graph - rises from $-\infty$, the lower far left, - crosses the x axis at $(0,0)$, rising, - turns and touches the x axis at $(5,0)$ where it - turns back up to rise to $+\infty$ the upper far right
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