# Math Nerds UNITE!

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## 190 Replies - 8197 Views - Last Post: 21 May 2009 - 12:03 PM

### #1 C++LVR

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# Math Nerds UNITE!

Posted 09 April 2009 - 09:16 AM

I'll post an easy one to start:

3x+9y=12
2x+4y=8

x=?
y=?

Is This A Good Question/Topic? 0

## Replies To: Math Nerds UNITE!

### #2 NeoTifa

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 09:18 AM

Student Lounge....

y = 0
x = 4

### #3 PsychoCoder

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 09:22 AM

Moved to Student Lounge

### #4 Zerobu

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 09:26 AM

neotifa is right!

Ok my turn.
This one's easy.

What's the derivative of 3x^3 - 3(4^5)^3

### #5 cfoley

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 09:29 AM

9x^2

This post has been edited by cfoley: 09 April 2009 - 09:31 AM

### #6 Zerobu

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 09:36 AM

thats right..for the first halve

### #7 C++LVR

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 09:37 AM

(5i*3i-(-6)^3)/3

*note*i denotes "imaginary numbers" It is not a variable

### #8 cfoley

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 09:40 AM

well, the second half is a constant so that goes to:

0[3(4^5)^3]^-1
=0

I didn't see any point adding + 0.

Solve for x:
log(x) + 1= x^2

Whoops that was impossible. Fixed!

This post has been edited by cfoley: 09 April 2009 - 09:50 AM

### #9 Zerobu

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 09:46 AM

and that right!!! I was really just looking for you to write down the simplified derivative, but that is acceptable.

### #10 NeoTifa

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 10:07 AM

C++LVR, on 9 Apr, 2009 - 08:37 AM, said:

(5i*3i-(-6)^3)/3

*note*i denotes "imaginary numbers" It is not a variable

5i-72

### #11 C++LVR

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 10:14 AM

You forgot to square the "i" and you must've missed the other minus sign.

### #12 NeoTifa

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 10:31 AM

No, then you didn't put the parenthesis in the right spot.

### #13 C++LVR

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 10:35 AM

You cube the -6 which gives you -216, and 5i*3i is an integer

### #14 Gloin

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 11:00 AM

There used to be a thread in the Games/Puzzles/Trivia/Jokes thread called Calculate this.
Those questions were a bit tougher though..

### #15 C++LVR

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## Re: Math Nerds UNITE!

Posted 09 April 2009 - 11:32 AM

no. ok If you multiply imaginary numbers, you get a negative number, since 1i = sqrt(-1) so 5i *3i = -15. so -15-(-216)=?

This post has been edited by C++LVR: 09 April 2009 - 11:32 AM