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November 14th, 2010, 04:59 PM  #1 
Newbie Joined: Jun 2010 Posts: 18 Thanks: 0  help!...I'm totally stuck solving for 'a'....
Hi. I have reduced a big set of formulas down to this final bit, but I have no idea how to take it further. Can anyone help? Thank you so much in advance. Solve for 'a'.... d = a^4  a^6/b^2 
November 15th, 2010, 03:03 AM  #2 
Senior Member Joined: Nov 2010 From: Staten Island, NY Posts: 152 Thanks: 0  Re: help!...I'm totally stuck solving for 'a'.... Multiply both sides by and bring everything to the left to get Make the substitution to get Now you can use the cubic formula to solve for u, from which it is easy to find a. 
November 15th, 2010, 02:41 PM  #3 
Newbie Joined: Jun 2010 Posts: 18 Thanks: 0  Re: help!...I'm totally stuck solving for 'a'....
Hey....thanks!!!! That's perfect. I really learned something new over the last FIVE hours! (studying the cubic formula). But then I found a calculator online to speed things up just a tiny bit... http://www.1728.com/cubic.htm Thanks for all the help. 

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