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location Colorado and Lincoln, NE
age 22
visits member for 3 years, 7 months
seen Oct 29 at 1:20

Computer Science Undergraduate at UNL. C#, .NET 4.5, Windows 8 lover.


May
16
revised Finding the limit when denominator = 0
added 349 characters in body
May
16
comment Finding the limit when denominator = 0
Thank you, that does make sense (of course DNE being the same thing as + or - infinity - + in this case). When I asked this question, I didn't know that it was positive both ways. Can you explain how to get + or - infinity from the following problem? $$\lim_{x \to 3^+} \frac{x - 4}{x - 3}$$
May
16
comment Finding the limit when denominator = 0
Yes, but what if the problem is $$\lim_{x \to 3^+} \frac{x - 4}{x - 3}$$. Approached from the right, it is $-\infty$ and from the left, it is $+\infty$. How do I tell if it is positive or negative infinity without graphing it or plugging in numbers?
May
16
comment Finding the limit when denominator = 0
Thanks for the answer, but I'm having trouble understanding this (I'm reviewing for a Calc 1 final). I'm not sure what $\forall$ and $\in$ are. Also, I'm not sure what M stands for.
May
16
comment Finding the limit when denominator = 0
I know that I could do it like that, but that's still plugging in values (albeit inside your head). I'm interested to find a way to solve it without plugging in numbers (even if it's in your head) or graphing it. It makes more sense to me if I can understand how the math works in an absolute sense.
May
16
comment Finding the limit when denominator = 0
I did not know you could change limits like that. If I change $$\lim_{x \to -2^-}$$ to $$\lim_{x \to 0^-}$$ what must happen to the rest of the function? Is there a rule for this?
May
16
comment Finding the limit when denominator = 0
yes, but the question is how do I solve it without plotting? how do I know that it goes to infinity and if it is positive or negative?
May
16
asked Finding the limit when denominator = 0
May
16
awarded  Scholar
May
16
accepted Finding a one sided limit algebraically (not plugging in numbers)
May
16
comment Finding a one sided limit algebraically (not plugging in numbers)
@Tyler - Can you give an example of working that out?
May
16
awarded  Student
May
16
comment Finding a one sided limit algebraically (not plugging in numbers)
and what about equations such as lim(x->-2 from the left) of 1/(x+2)^2
May
16
comment Finding a one sided limit algebraically (not plugging in numbers)
thank you! I can't believe I missed that
May
16
asked Finding a one sided limit algebraically (not plugging in numbers)
May
16
awarded  Autobiographer