Date: Oct 23, 2012 12:31 PM
Author: Brian Swanagan
Subject: Re: [ap-calculus] limit from Stu Schwartz
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Another way to view it might be what we often do for rational functions.

lim_(x - > -inf) (3x^4 - 3x^3 + 5x^2 + 8x - 3) =

lim_(x - > -inf) (3x^4 - 3x^3 + 5x^2 + 8x - 3)/1 =

lim_(x - > -inf) (3x^4 - 3x^3 + 5x^2 + 8x - 3)/1 * (1/x^4)/(1/x^4) =

lim_(x - > -inf) [3 - 3/x + 5/x^2 + 8/x^3 - 3/x^4]/[1/x^4] -> (3 + 0 + 0 +

0 + 0)/(+0) -> +/+ inf = + inf

On Mon, Oct 22, 2012 at 9:16 AM, Tammy Slack <tslack@bgcsd.org> wrote:

> NOTE:

> This ap-calculus EDG will be closing in the next few weeks. Please sign up

> for the new AP Calculus

> Teacher Community Forum at

> https://apcommunity.collegeboard.org/getting-started

> and post messages there.

>

> ------------------------------------------------------------------------------------------------

> Can anyone tell me how to solve the limit as x approaches negative

> infinity of (3x^4 - 3x^3 + 5x^2 + 8x - 3)? I assume it is positive or

> negative infinity but don't know how to tell which it is.

> ---

> To search the list archives for previous posts go to

> http://lyris.collegeboard.com/read/?forum=ap-calculus

>

--

Brian Swanagan, PhD

Model High School

Mathematics Teacher

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