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  #11  
Old 05-08-2009, 12:50 PM
bas_I_am
vision
 
Join Date: Jun 2005
Location: living on a psychedelic pig farm
Posts: 514
Re: anyone good at algebra?
Quote:
Originally Posted by bryantm3 View Post
There's no y, though— there's only one equation, and it's a binomial.
X to the power of 2/3, minus 9x to the power of 1/3, plus eight equals zero.


x^(2/3) - 9x^(1/3) + 8 = ( √x) - 9(√x) + 8

set y = √x

( √x) - 9(√x) + 8 y - 9y + 8 = 0 → ( y - 8 )( y - 1) = 0

r = { 8, 1 }

r 8 → √x → 8 = x = 512 → ( √512) - 9(√512) + 8 = 8 - 9(8) + 8 = 64 - 72 + 8 = 0
r 1 → = √x → 1 = x = 1 → ( √1) - 9(√1) + 8 = 1 - 9(1) + 8 = 1 - 9 + 8 = 0

Last edited by bas_I_am; 05-08-2009 at 12:56 PM.
  #12  
Old 05-09-2009, 06:33 AM
Dunwho
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Join Date: Oct 2007
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Posts: 834
Re: anyone good at algebra?
eee gaz.... now i defo dont miss maths class.
  #13  
Old 05-12-2009, 08:32 AM
bas_I_am
vision
 
Join Date: Jun 2005
Location: living on a psychedelic pig farm
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Re: anyone good at algebra?
Quote:
Originally Posted by Jan View Post
How would you solve something like this?
x^4 + p * x^2 + q = 0
x^4 + p * x^2 + q = (x) + px + q = 0

let y = x y + py + q, and apply quadratic formula
with D = p + 4q y = (-p √D)/2 x = √((-p √D)/2)
  #14  
Old 05-14-2009, 04:25 AM
sola sistim
a firestorm to purifyyyyy
 
Join Date: Jun 2005
Location: Victoria, Australia
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Re: anyone good at algebra?
WHAT THE FUCK IS THIS?

and i thought i wasnt too bad at maths..
never actually done anything like that. didnt even know you could add letters.. hahah
  #15  
Old 05-14-2009, 06:01 AM
big screen satellite
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Re: anyone good at algebra?
does Wolverine appear in x^4 + p * x^2 + q = (x) + px + q = 0?

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