# Some funny stuff on math tests

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## 19 Replies - 2182 Views - Last Post: 31 January 2011 - 06:47 AM

### #1 tor.ment0r

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# Some funny stuff on math tests

Posted 10 August 2010 - 06:00 PM

here is a link to some real math test answers of some students

weird ?
Is This A Good Question/Topic? 2

## Replies To: Some funny stuff on math tests

### #2 eZACKe

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## Re: Some funny stuff on math tests

Posted 10 August 2010 - 06:16 PM

I don't know about weird, but definitely pretty funny.

Love the Calculus "Explain the shape of the graph" one.

### #3 bcranger

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## Re: Some funny stuff on math tests

Posted 10 August 2010 - 10:16 PM

Dang, very funny, especially the find X and limits one LOL

### #4 Mercurial

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## Re: Some funny stuff on math tests

Posted 12 August 2010 - 05:19 PM

Absolutely AWESOME! "no there is an elephant in the way" I can't stop laughing.

### #5 bennitto

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## Re: Some funny stuff on math tests

Posted 12 August 2010 - 06:07 PM

the find x one is legendary

I'd seen it before but still it was still funny seeing that again

### #6 jyth

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## Re: Some funny stuff on math tests

Posted 16 August 2010 - 12:52 PM

Try this.

y = 2y popped up on friend of mines question worth 5 marks on a 15 mark Calculus 2 university exam.
He was taking the course online from a different university this summer.

### #7 gibson.nathan

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## Re: Some funny stuff on math tests

Posted 16 August 2010 - 01:42 PM

"it is a very aesthetically pleasing line."

### #8 guahguahmonster

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## Re: Some funny stuff on math tests

Posted 17 August 2010 - 11:22 PM

Nice, but one of them is wrong. The limit of 1 / (x - 8) as x approaches 8 isn't infinity--it's nonexistent as the limit is different for the two sides.

### #9 Travis1012

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## Re: Some funny stuff on math tests

Posted 18 August 2010 - 12:52 AM

very funny lol.

### #10 NeoTifa

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## Re: Some funny stuff on math tests

Posted 18 August 2010 - 05:51 AM

Was there a direction it came from guah? XD

### #11 simeesta

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## Re: Some funny stuff on math tests

Posted 09 September 2010 - 03:26 PM

guahguahmonster, on 18 August 2010 - 07:22 AM, said:

Nice, but one of them is wrong. The limit of 1 / (x - 8) as x approaches 8 isn't infinity--it's nonexistent as the limit is different for the two sides.

although x/0 is undefined - not nonexistent, the limit as x tends towards 8 does approach infinity, which is correct

### #12 Nikitin

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## Re: Some funny stuff on math tests

Posted 09 September 2010 - 05:54 PM

simeesta, on 09 September 2010 - 03:26 PM, said:

although x/0 is undefined - not nonexistent, the limit as x tends towards 8 does approach infinity, which is correct

Wrong.

### #13 simeesta

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## Re: Some funny stuff on math tests

Posted 09 September 2010 - 06:38 PM

Nikitin, on 10 September 2010 - 01:54 AM, said:

simeesta, on 09 September 2010 - 03:26 PM, said:

although x/0 is undefined - not nonexistent, the limit as x tends towards 8 does approach infinity, which is correct

Wrong.

how is it wrong??

Real Projective line
Joke

This post has been edited by simeesta: 09 September 2010 - 06:48 PM

### #14 mojo666

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## Re: Some funny stuff on math tests

Posted 10 September 2010 - 09:02 AM

There are 2 limits as x tends towards 8. You can approach 8 from 2 directions. The limit differs depending on which direction you approach 8. If you approach 8 from the left, the limit is negative infinity. If you approach it from the right, the limit is infinity.

### #15 simeesta

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## Re: Some funny stuff on math tests

Posted 10 September 2010 - 12:48 PM

mojo666, on 10 September 2010 - 05:02 PM, said:

There are 2 limits as x tends towards 8. You can approach 8 from 2 directions. The limit differs depending on which direction you approach 8. If you approach 8 from the left, the limit is negative infinity. If you approach it from the right, the limit is infinity.

so it does equal infinity - BUT it also equals negative infinity. so it is correct, but an incomplete answer?? also if you follow my link it explains why infinity equals negative infinity - Real projective line.

incomplete as in square root of 4 is 2, and also minus 2. just writing two is correct but incomplete??

This post has been edited by simeesta: 10 September 2010 - 12:49 PM