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So I know that the verticle asymptote is at x = -2, the horizontal asymptote at y = 1, and the point discontinuity is at (0,3).

 

So far, I have \({x - 3 \over (x + 2)(x - 3)}\). I'm not sure about what to do next?

 

Thank you! :)

 May 22, 2019
 #1
avatar+128474 
+3

If the horizontal asymptote = 1  then  the degree of the numerator = the degree of the denominator and the coefficients on the lead terms will be the same....

 

If we have a vertical asymptote at x = -2  then  ( x + 2)  must be a linear factor in the denominator

 

Note that   x = - 6 is a root....therefore  (x + 6)  must be a factor in the numerator

 

So.....the polynomial  that we are looking for is

 

x ( x + 6)

_______

x (x + 2)

 

 

When the x"s   are cancelled,  we end up with  (x + 6) /(x + 2) ....and when x = 0, y = 3

But x cannot = 0  because the original function is undefined at that point....so....the "hole" occurs at (0, 3)

 

Here's the graph  with the asymptotes and pertinent points : https://www.desmos.com/calculator/wge4wepw0i

 

 

cool cool cool

 May 22, 2019
edited by CPhill  May 22, 2019
 #2
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+1

Just wanted to clarify, will the horizontal asymptote always equal the degree of the numerator and denominator? :)

Guest May 22, 2019
 #3
avatar+128474 
+2

Sorry.....I meant to say that if the horizontal asymptote  is y = 1.....the degree of the polynomials in the numerator and denominator is the same and their lead coefficients are also the same....

 

cool cool cool

CPhill  May 22, 2019

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