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Mathematics 22 Online
OpenStudy (anonymous):

Help with graphing, will give a medal! (problem below)

OpenStudy (anonymous):

\[\frac{ x^3-1 }{ x^2-4 }\]

OpenStudy (anonymous):

it might help to rewrite it as \[y=\frac{(x-1)(x^2+x+1)}{(x+2)(x-2)}\]

OpenStudy (anonymous):

that way you see that there are vertical asymptotes at \(x=-2\) and at \(x=2\)

OpenStudy (anonymous):

I already reached those steps, but I'm having alot of trouble graphing this equation because of the slant asymptote

OpenStudy (anonymous):

it might also be useful to divide since the numerator is degree one more than the denominator you will get \(y=x+fractions\)

OpenStudy (anonymous):

that means the slant asymptote is the line \(y=x\)

OpenStudy (anonymous):

|dw:1398048010539:dw|

OpenStudy (anonymous):

did you get y=x from long division?

OpenStudy (anonymous):

yes, except i didn't really do it just eyeballed it

OpenStudy (anonymous):

\(x^3\) divided by \(x^2\) is \(x\) and the rest is the remainder, which will go to zero as \(x\) goes to infinity but you can do the long division too, just ignore the remainder

OpenStudy (anonymous):

ahh, ok. Just curious, can asymptotes ever be passed?

OpenStudy (anonymous):

vertical no

OpenStudy (anonymous):

horizontal yes

OpenStudy (anonymous):

ok, cool, I think I got it from here, thanks for your help!

OpenStudy (anonymous):

yw test a few points and you will see what it looks like has to respect those asymptotes

OpenStudy (anonymous):

ok thank you again :)

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