A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Simple question; Asymptotes with two answers  need explanation (look below for image and more details)
anonymous
 one year ago
Simple question; Asymptotes with two answers  need explanation (look below for image and more details)

This Question is Closed

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I know the solution is 6/2 and 3 , however I dont understand why 3 turns into 3. Would appreciate explaination :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0hey are you still here, I can help but I would need you to participate

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.0for \(\lim_{x\rightarrow \infty} \dfrac{6x^23x+4}{2x^28}\) just compare the coefficients of the highest power, in this case, \(\color{red}{x^2}\)

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.0That will give you your reason for the limit being 3.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\frac{ 6x^{2}3x + 4 }{ 2x^{2}8 } = \frac{ x^{2}(6  \frac{ 3 }{ x }+ \frac{ 4 }{ x^{2} }) }{ x^{2}(2\frac{ 8 }{ x^{2} } )} = \frac{ 6  \frac{ 3 }{ x } +\frac{ 4 }{ x^{2} }}{ 2\frac{ 8 }{ x^{2} } }\] From here if you take the limit it should make sense how you get a limit of 3. \[\lim_{x \rightarrow \infty}\frac{ 6  \frac{3}{x} + \frac{4}{x^{2}} }{ 2\frac{8}{x^{2}} } = \frac{ 6  0 + 0 }{ 2 0 } = 3\] Now on the 2nd line where you started doing the limit a different way, it looked like you divided every term by x instead of \(x^{2}\). Of course dividing by (or factoring out) \(x^{2}\) is what should be done, but let me take it from where you had it with only dividing by x: (after dividing by x) \[\lim_{x \rightarrow \infty}\frac{ 6x 3 + \frac{4}{x} }{ 2x  \frac{8}{x} } = \frac{ \infty  3 + 0 }{ \infty  0 }\] When you got to here, it looked like you tried to cancel out infinity or something. First of all, you cannot cancel out infinity. Different parts of a function can go to plus or minus infinity at different speeds. There is no equality from one infinity to another, they cannot cancel out. \[\frac{ \infty  3 + 0 }{ \infty  0 } = \frac{ \infty }{ \infty }\] This is an indeterminant form. In which case, if you wanted although its unncessary, you could use L' hopital's rule but the above shows why that isnt needed. So that was your error, cannot cross out infinity and the final result should be the indeterminant form \(\frac{\infty}{\infty}\). Long explanation, but hopefully that makes sense.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0wow @Concentrationalizing that was a pretty dang good response man...

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It's only good if it makes sense though, lol.

sepeario
 one year ago
Best ResponseYou've already chosen the best response.0I think you should make sure you consider infinity as a concept, not a number.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh my god, I am an idiot! Of COURSE 6/2 is 3!! I was reading some examples and got the impression there would be two separate answers! But it was one all along.. Thanks a lot! *awards 10 dumb points to self*
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.