Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 2 - Section 2.5 - Continuity - 2.5 Exercises - Page 126: 62

Answer

The graph of the function has at least two x-intercepts in the interval $(0,2)$.

Work Step by Step

$y = x^2-3+\frac{1}{x}$ We can see that this function is continuous in the interval $(0,2)$. Let $x = \frac{1}{3}$ $y = (\frac{1}{3})^2-3+\frac{1}{1/3} = \frac{1}{9}$ Let $x = 1$ $y = (1)^2-3+\frac{1}{1} = -1$ Let $x = \frac{5}{3}$ $y = (\frac{5}{3})^2-3+\frac{1}{5/3} = \frac{17}{45}$ By the Intermediate Value Theorem, there is a number $b$ in $(\frac{1}{3}, 1)$ such that $b^2-3+\frac{1}{b} = 0$, and there is a number $c$ in $(1,\frac{5}{3})$ such that $c^2-3+\frac{1}{c} = 0$ The graph of the function has at least two x-intercepts in the interval $(0,2)$
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