Finite Math and Applied Calculus (6th Edition)

Published by Brooks Cole
ISBN 10: 1133607705
ISBN 13: 978-1-13360-770-0

Chapter 10 - Section 10.3 - Limits and Continuity: Algebraic Viewpoint - Exercises - Page 721: 103

Answer

The indeterminate form is $\displaystyle \frac{\pm\infty}{\infty}$. These limits equal $0.$

Work Step by Step

When $ x\rightarrow\infty$, the polynomial, depending on the sign of the leading term, veers off to either $+\infty$ or $-\infty.$ For the exponential function, $e^{x}\rightarrow\infty.$ The indeterminate form is $\displaystyle \frac{\pm\infty}{\infty}$. Using a calculator, $e^{500}=1.4\times 10^{217}$, which is huge. A polynomial would have to have a degree of about 214 to catch up. The denominator increases at a faster rate (orders of 10) than the polynomial in the numerator, so the ratio approaches 0 as $ x\rightarrow\infty$.
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