Notices
Results 1 to 10 of 10

Thread: Birthday Equation

  1. #1 Birthday Equation 
    Forum Freshman
    Join Date
    Mar 2011
    Posts
    39
    It's my friend's dad's birthday and we wrote him an equation to which the answer is his age (he doesn't know that). It's nothing spectacular, we only had like 15 min and this probably child's play to most of you, but try to find his age. btw we are only in precalc so no complex concepts.



    LaTex doesn't really make this evident (probably due to my lack of knowledge of LaTex) but i is to the power of (log 10^17)(-2)(cos 14pi/2).


    Reply With Quote  
     

  2.  
     

  3. #2 Re: Birthday Equation 
    . DrRocket's Avatar
    Join Date
    Aug 2008
    Posts
    5,486
    Quote Originally Posted by Cleverusername
    It's my friend's dad's birthday and we wrote him an equation to which the answer is his age (he doesn't know that). It's nothing spectacular, we only had like 15 min and this probably child's play to most of you, but try to find his age. btw we are only in precalc so no complex concepts.



    LaTex doesn't really make this evident (probably due to my lack of knowledge of LaTex) but i is to the power of (log 10^17)(-2)(cos 14pi/2).
    Since g is a constant the requested derivative is 0. You have a biological rarity if your friend's dad is a newborn.


    Reply With Quote  
     

  4. #3  
    Forum Bachelors Degree x(x-y)'s Avatar
    Join Date
    Jul 2010
    Location
    UK
    Posts
    462
    Haha!
    "Nature doesn't care what we call it, she just does it anyway" - R. Feynman
    Reply With Quote  
     

  5. #4 Re: Birthday Equation 
    Forum Freshman
    Join Date
    Mar 2011
    Posts
    39
    Quote Originally Posted by DrRocket
    Since g is a constant the requested derivative is 0. You have a biological rarity if your friend's dad is a newborn.
    g has an x to a power greater than 0 in it, and even if it didn't when you plugged it into f(x) you would get an x with a power greater than 0. I'm probably misunderstanding something, my knowledge in this is limited so please excuse my ignorance
    Reply With Quote  
     

  6. #5 Re: Birthday Equation 
    . DrRocket's Avatar
    Join Date
    Aug 2008
    Posts
    5,486
    Quote Originally Posted by Cleverusername
    Quote Originally Posted by DrRocket
    Since g is a constant the requested derivative is 0. You have a biological rarity if your friend's dad is a newborn.
    g has an x to a power greater than 0 in it, and even if it didn't when you plugged it into f(x) you would get an x with a power greater than 0. I'm probably misunderstanding something, my knowledge in this is limited so please excuse my ignorance
    No, it doesn't as you wrote it. There is no "x" to the right of "=" in the expression for g(x).
    Reply With Quote  
     

  7. #6 Re: Birthday Equation 
    Forum Freshman
    Join Date
    Mar 2011
    Posts
    39
    Quote Originally Posted by DrRocket
    No, it doesn't as you wrote it. There is no "x" to the right of "=" in the expression for g(x).
    -_- my bad. it should be 18 * x^i^(log 10^17) etc...

    I will try to fix it as soon as I can. going to have to rewrite the whole thing because it's an image
    Reply With Quote  
     

  8. #7  
    Forum Freshman
    Join Date
    Mar 2011
    Posts
    39
    Okay here is the correct one. I added an x as well as fixed the factorials.

    2 things that the LaTex shows in a weird way that I couldn't fix are

    1. i is to the power of (log 10^17)(-2)(cos 14pi/2), i is NOT multiplied by those.

    2. it is log 10^17, not log (10^1) 7.

    Reply With Quote  
     

  9. #8  
    Forum Radioactive Isotope MagiMaster's Avatar
    Join Date
    Jul 2006
    Posts
    3,440
    You can post Tex code here using the [ tex ] tags.
    Reply With Quote  
     

  10. #9  
    Forum Freshman
    Join Date
    Mar 2011
    Posts
    39
    Quote Originally Posted by MagiMaster
    You can post Tex code here using the [ tex ] tags.
    I know, but it kept on saying something along the lines that the code is dangerous. I looked up how to fix the issue but nothing worked so I just used the image.
    Reply With Quote  
     

  11. #10  
    Moderator Moderator
    Join Date
    Jun 2005
    Posts
    1,620
    Remember that [ tex ]x^2 +3[ /tex] renders whereas [ tex ]x^{2+3}[/ tex] renders .

    And just as well it makes that distinction too!!
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •