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June 1st, 2014, 08:35 AM  #1 
Newbie Joined: Jun 2014 From: UK Posts: 14 Thanks: 0  basic rearrange
Apparently 2y+4=x3 can be rearranged to x2y7=0 If you deduct 2y from both sides of 2y+4=x3 you get 4=x32y, but I thought if you added 4 the 3 on the right would change to +1. Evidently the operator is disregarded and 4 is added to the 3 on the right. Sure this is pretty basic, but it's been a long time since I studied this. cheers Mark Last edited by skipjack; June 1st, 2014 at 11:02 AM. 
June 1st, 2014, 10:42 AM  #2 
Senior Member Joined: Jul 2012 From: DFW Area Posts: 642 Thanks: 99 Math Focus: Electrical Engineering Applications 
Hi markcr, You need to deduct 4 from each side, not add: $\displaystyle \large \begin{align} 2y +4 &= x3 \\ 2y+42y &= x32y \\ \\ 4 &= x32y \\ 44 &= x32y4 \\ \\ 0 &= x2y7 \\ \end{align} $ 
June 1st, 2014, 01:07 PM  #3 
Newbie Joined: Jun 2014 From: UK Posts: 14 Thanks: 0 
thanks! I have a feeling this forum is going to be a great help with my endeavours... Mark 
June 1st, 2014, 01:55 PM  #4  
Senior Member Joined: Jul 2012 From: DFW Area Posts: 642 Thanks: 99 Math Focus: Electrical Engineering Applications  Quote:
For some reason, I failed to do so this time, so: welcome to the forums!  

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