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September 29th, 2012, 05:54 PM  #1 
Newbie Joined: Sep 2012 Posts: 4 Thanks: 0  Help with Algebra Question
Have a problems with question Make x the subject: y=2?(3x^21 ) I've tried lots of different ways but I can't quite get the answer. I think I have to get rid of the ? first. That's what I'm not sure about. Anyway the answer is: x=?((y^2+ 4)/12 ) 
September 29th, 2012, 06:23 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,963 Thanks: 1148 Math Focus: Elementary mathematics and beyond  Re: Help with Algebra Question The above accounts for the possibility of negative x. 
September 29th, 2012, 06:31 PM  #3  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: Help with Algebra Question Hello, walker8476! Quote:
Take it one step at a time. Look at what was being done to the x. (1) x is squared. (2) Then multiplied by 3. (3) Then 1 is subtracted. (4) Then the square root is taken. (5) Then the result is multiplied by 2. Now, we read up the list, using the inverse operations.  
September 30th, 2012, 03:09 PM  #4 
Newbie Joined: Sep 2012 Posts: 4 Thanks: 0  Re: Help with Algebra Question
Thank you both. I understand now. I like the approach of writing out the steps then going up the list. I never knew about this approach. Everything is simple when you break it down! 

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