# Foo - Hi all.. Got Calculus? :beer:

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View Full Version : Hi all.. Got Calculus? :beer:

red house
07-23-07, 04:33 PM
Okay two problems..

first one;

evaluate the limit: lim as x -> 9 for (1/x - 1/9) / (x - 9)

evaluate the limit: lim as x -> 9 for (9 - x) / (3 - {sqr root of x** )

btw, I already know the answer(s) of course.. I just want to see if you're anywhere near as smart as I. :beer:

;)

Thankyou much. :)

KingTermite
07-23-07, 04:35 PM
Homework, I'm guessin.

Siu Blue Wind
07-23-07, 04:38 PM
Okay two problems..

first one;

evaluate the limit: lim as x -> 9 for (1/x - 1/9) / (x - 9)

evaluate the limit: lim as x -> 9 for (9 - x) / (3 - {sqr root of x** )

btw, I already know the answer(s) of course.. I just want to see if you're anywhere near as smart as I. :beer:

;)

Thankyou much. :)

Uh huh yeah right. Cheater. Plllllllllllllttt!! :p (that was a raspberry)

red house
07-23-07, 04:38 PM
Homework, I'm guessin.

You guessed right! .. ANy chance you could guess right the solutions as well :D -? . . Man, I don't know how to do that kind of algebra. I was guessing 0, 1, -1, 3, -3, 1/9, -1/9 and DNE.. and I only have three guesses left for the first one, and four guesses left for the second problem for this on-line homework thing. I need a life line.

red house
07-23-07, 04:39 PM
Uh huh yeah right. Cheater. Plllllllllllllttt!! :p (that was a raspberry)

No, not at all.. My professor didn't say I couldn't make use of foo. He never said that.

polara426sh
07-23-07, 05:00 PM
http://img.photobucket.com/albums/v650/polara426sh/u-do-mah-homework.jpg

markhr
07-23-07, 05:21 PM
I'd ask my first class honors math :beer: brother :fight: but he's busy creating mobile phone stuff for his company :beer:

red house
07-23-07, 05:21 PM
http://img.photobucket.com/albums/v650/polara426sh/u-do-mah-homework.jpg

Come on ppl, I only have until 10pm EST to submit the answers, and the computer lab closes at 9. I know most of you are computer geeks who could do this in your sleep.. or maybe you can't? Maybe these problems are beyond the intellect of even the most math proficient foogeek. Maybe I came to the wrong place. Maybe..

markhr
07-23-07, 05:40 PM
Come on ppl, I only have until 10pm EST to submit the answers, and the computer lab closes at 9. I know most of you are computer geeks who could do this in your sleep.. or maybe you can't? Maybe these problems are beyond the intellect of even the most math proficient foogeek. Maybe I came to the wrong place. Maybe..

instead of offering it up as a challenge why not offer goods/services instead?

free lawn mowing every second sunday
free bike chain cleaning every weekend
free personal queue place holder for 6 months
positive feedback for life on e-bay
free personal grocery shopping every second monday night
free beer and dogs delivery service at any major/minor/pro game so they don't have to leave their seats

red house
07-23-07, 05:41 PM
instead of offering it up as a challenge why not offer goods/services instead?

free lawn mowing every second sunday
free bike chain cleaning every weekend
free personal queue place holder for 6 months
positive feedback for life on e-bay
free personal grocery shopping every second monday night
free beer and dogs delivery service at any major/minor/pro game so they don't have to leave their seats

You got it. Really. :) :beer:

red house
07-23-07, 05:42 PM
Pls, don't toy with me..

KingTermite
07-23-07, 05:44 PM
You could spend your time more constructively trying to read the book and figure it out, or google search tutorials rather than wasting time in here trying to get us to do it for you.

red house
07-23-07, 05:47 PM
You could spend your time more constructively trying to read the book and figure it out, or google search tutorials rather than wasting time in here trying to get us to do it for you.

It's only 'wasting time' - if you guys don't do it. So PLS, stop wasting my time! (I don't have that much more time for you to waste). thanks.. :)

JoeMetal
07-23-07, 05:49 PM
If you don't get it by 7:30, I'll think about giving you the answers. It'd be nice if you tried to work through it.

Here's a couple hints: for the first one, find a common denominator in the numerator (that sounds complicated). I'll be willing to bet you'll get something to cancel with the 9-x on the bottom ;)

as for the second one, does thinking of a problem like finding the lim as x goes to 9 for (9-x^2)/(3-x) help?

VegaVixen
07-23-07, 05:56 PM
http://img.photobucket.com/albums/v650/polara426sh/u-do-mah-homework.jpg

Gah! That resembles the <curious Vega look> ! :eek:

*thunk*

red house
07-23-07, 05:58 PM
If you don't get it by 7:30, I'll think about giving you the answers. It'd be nice if you tried to work through it.

Here's a couple hints: for the first one, find a common denominator in the numerator (that sounds complicated). I'll be willing to bet you'll get something to cancel with the 9-x on the bottom ;)

as for the second one, does thinking of a problem like finding the lim as x goes to 9 for (9-x^2)/(3-x) help?

Thankyou JoeMetal.. I was starting to lose faith in foo. Btw, what do you think about all these other worthless spectators? Are they 'worthless', or what? :) :beer:

JoeMetal
07-23-07, 06:00 PM
Can you at least try to work for it? I'm not just going to give out answers for free.

Jerseysbest
07-23-07, 06:02 PM
If I was still in high school, I could probably help you out, but I'm lost touch with the math gods...

VegaVixen
07-23-07, 06:03 PM
Thankyou JoeMetal.. I was starting to lose faith in foo. Btw, what do you think about all these other worthless spectators? Are they 'worthless', or what? :) :beer:

Worthless? Baybuh, you lied to us in the OP! :eek:

red house
07-23-07, 06:08 PM
Worthless? Baybuh, you lied to us in the OP! :eek:

No, I never lie.. Sometimes I might exaggerate. Sometimes I may elude to something which isn't 'entirely' the actual truth. But you'll never catch me in a lie.

polara426sh
07-23-07, 06:22 PM
Okay two problems..

stuff I don't know

btw, I already know the answer(s) of course.. I just want to see if you're anywhere near as smart as I. :beer:

;)

Thankyou much. :)

You don't know the answer, so isn't that a lie?

Siu Blue Wind
07-23-07, 06:26 PM
A liar and a cheater. Yuckos. I'm disappointed in you, Redhouse.

red house
07-23-07, 06:27 PM
A liar and a cheater. Yuckos. I'm disappointed in you, Redhouse.

How is that possible :D -?

JoeMetal
07-23-07, 06:29 PM

Siu Blue Wind
07-23-07, 06:37 PM

^^^Tough teacher!! :D

JoeMetal
07-23-07, 06:43 PM
^^^Tough teacher!! :D

Well, I am a grad student with a final goal of becoming a professor. So yeah, I am a tough teacher. :p

Siu Blue Wind
07-23-07, 07:00 PM
HIGH FIVE, JOE!! *slap!* :D

HAH!! Now whaddya think bout THAT, Redhouse?

Tom Stormcrowe
07-23-07, 07:03 PM

Good for you, Joe! Stand that ground......if'n he don't larn that cypherin', then he ain't never gonna measure up!;)

red house
07-23-07, 07:21 PM
Well, I am a grad student with a final goal of becoming a professor. So yeah, I am a tough teacher. :p

Thanks for the help, Joe Metal.. I'm afraid I haven't much to show for work though. Just some dead ends. I'm going to give it one more try though before calling it a night and go home. But thanku for the suggestion. You were much more help than anyone else. :) :beer:

Siu Blue Wind
07-23-07, 07:27 PM
Oh POO, Redhouse. Your friends want you to learn. So quitchersquabblin.

But I still love ya. :)

jschen
07-23-07, 07:30 PM
Can I solve those in my sleep? Most definitely. Will I tell you the answer? No way. Same rules as when I helped phantomcow2. Tell me what you've done so far, showing your work. (Including any dead end approaches.) Explain to me what you're stuck with. Then I'll happily try to figure out what concept you're misunderstanding and try to help point you in the right direction. Right now, you just seem lazy.

jschen
07-23-07, 07:34 PM
btw, I already know the answer(s) of course.. I just want to see if you're anywhere near as smart as I. :beer:

But you'll never catch me in a lie.
Yeah, sure, whatever.

red house
07-23-07, 07:44 PM
If you don't get it by 7:30, I'll think about giving you the answers. It'd be nice if you tried to work through it.

Here's a couple hints: for the first one, find a common denominator in the numerator (that sounds complicated). I'll be willing to bet you'll get something to cancel with the 9-x on the bottom ;)

as for the second one, does thinking of a problem like finding the lim as x goes to 9 for (9-x^2)/(3-x) help?

Okay.. let's begin with the above. I am confused because I don't know how do get 9 - x to cancel on the bottom, the denominator is (x - 9) ? And if I try and find a denominator in the numerator I get ( 9 - x ) / (9x) -from; 1/x - 1/9 .. I thank you guys for your patience and willingness to help out, but it's pretty hopeless at this point. I am no closer than I was before. :P

Also, I am not quite sure how lim-> 9 for (9-x^2)/(3-x) was derived from the second problem, and also this = 12 which is not the correct answer.

jschen
07-23-07, 07:50 PM
Okay.. let's begin with the above. I am confused because I don't know how do get 9 - x to cancel on the bottom, the denominator is (x - 9) ? And if I try and find a denominator in the numerator I get ( 9 - x ) / (9x) -from; 1/x - 1/9 .. I thank you guys for your patience and willingness to help out, but it's pretty hopeless at this point. I am no closer than I was before. :P

Good. So you recognize that 1/x - 1/9 = (9 - x) / 9x
You are MUCH closer than before. Since these two terms are equal, substitute one for the other. Now what do you see?

red house
07-23-07, 07:56 PM
I don't see anything? What am I supposed to do with (9 - x) / (9x) / (x-9) ? And with 2 minutes until the library closes too.. thanks man, but I think I just waited a little to late to post these for your guys to help me. I do appreciate it though. :beer:

jschen
07-23-07, 07:58 PM
(a / b) / c = a / (b * c)

You see why that is? You see how to take advantage of that fact?

red house
07-23-07, 08:01 PM
Is it; 1/x - 1/9 = (9 - x) / 9x = 1/x - 9x^2 / x = 1 - 9x ^ 2 / x ?

red house
07-23-07, 08:03 PM
(a / b) / c = a / (b * c)

You see why that is? You see how to take advantage of that fact?

Oh, thanks.. :D I wish you guys had pointed that formula out earlier - thy're turning off the lights in the library. :rolleyes: . . :P

But seriously, thanku :)

jschen
07-23-07, 08:04 PM
Is it; 1/x - 1/9 = (9 - x) / 9x = 1/x - 9x^2 / x = 1 - 9x ^ 2 / x ?

Oh my...

No.

I wish you guys had pointed that formula out earlier

You weren't at that stage of the problem. And it wasn't clear that that was what you were stuck on. But seriously... if that formula isn't obvious to you, you've got a LOT of studying ahead of you.

Good luck. Ask questions about specifics, and you'll get answers. Hide behind testing my intelligence again, and you'll get no response. Ever.

red house
07-23-07, 08:05 PM
Is it -1/162 ?..pls, I only have one more guess :D -?

jschen
07-23-07, 08:08 PM
Don't guess. Guessing is a waste of your time and mine. Learn to solve the problem. Ask about things you're stuck on. If you ever spew random guesses without showing work again, I'll stop wasting my time on you. Ask about things you're stuck on, and I'll happily keep trying to explain things.

red house
07-23-07, 08:08 PM
:P . .Yo man, that was not a guess. It was just wrong

jschen
07-23-07, 08:09 PM
But you don't show me how you got to that answer, so it doesn't give me any insight into what you're doing wrong.

red house
07-23-07, 08:14 PM
Thanks.. they're coming for me. If I knew what I was stuck on - then I would know how to unstuck myself. If I ask my professor how to do a problem, my experience is that they will usually show me using a similar if not the same problem. Maybe if next time someone has a similar predicament you guys can solve a similar problem, and demonstrate how it's done.. I think that this would be more productive for everyone.. and maybe more gratifying too - since the lesson would be conveyed properly and w/o confusion or ambiguity. Okay, this guy says I have to stop now. Peace y'all, once again thanks for your help.

jschen
07-23-07, 08:21 PM
If you show us what you've done and explain why you don't think you can get from where you are to where you need to be in the problem, then even if you don't know what you're stuck on, it gives others insight to point it out. I'm not going to solve a similar problem for you. That's just one step away from solving the problem for you and doesn't teach you to understand the material. It teaches you to do something by rote without learning the material. Someone else may see things differently, but I believe that "helping" someone that way is a waste of time for both parties.

My teaching style may not be to your liking. That's fine, and someone else may suit you better. One part of learning effectively is finding someone whose teaching style fits with your learning style. Anyway, good luck with the material.

ManBearPig
07-23-07, 08:22 PM
Okay two problems..

first one;

evaluate the limit: lim as x -> 9 for (1/x - 1/9) / (x - 9)

evaluate the limit: lim as x -> 9 for (9 - x) / (3 - {sqr root of x** )

btw, I already know the answer(s) of course.. I just want to see if you're anywhere near as smart as I. :beer:

;)

Thankyou much. :)

Man, if this were still 1997 I could do this in my sleep. Now I haven't a clue. I did retain the principles, however.

red house
07-23-07, 08:29 PM
Thanks.. Jschen. I know you're teaching style is 'unique' and individual like everyone elses, - but this is a pretty hopeless method in this forum, with these particular problems, or perhaps just with me. I gave it my best effort.. and just came up short. But I do appreciate your effort(s) to help. I'm just fustrated, that's all. I bribed the library man to go away, but he is on his way back before he locks up. Thankyou everyone. Good nite. :) :beer:

jschen
07-23-07, 08:35 PM
It worked with katrogen, phantomcow2, and perhaps a few others. But you're not them, and it's evidently not working for you. Anyway, good luck, and don't hesitate to ask if you run into something where you think my method of going about things would be of help.

JoeMetal
07-23-07, 09:03 PM
Hey, sorry I disappeared, but I had to get my nightly ride in. :) I know you probably won't want to work on this now, since it is past due, but if you want help on how to solve a problem like this (or pretty much any math problem you'll run in to) feel free to drop me a PM. I was a math tutor in my undergrad for three years, and people seemed to like me.

vpiuva
07-23-07, 09:16 PM
Just think, I took AP Calculus BC in HS, placed out of a year of engineering calculus in college, and probably couldn't do that problem now. :crash: But seriously, I'm not going to try. The last time I needed to use limits was.......................before I graduated, so prior to 1980. Just think what all this learnin's gonna get ya. :)