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March 30th, 2009, 09:51 AM  #1 
Newbie Joined: Mar 2009 Posts: 3 Thanks: 0  Algebra problem!
I've got the following equation: 2?2x5+4?2 belongs to Q i need to get x = 2 but don't know how to solve it! 
March 30th, 2009, 10:01 AM  #2 
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: Algebra problem!
What does "2?2x5+4?2" mean? If this is a fraction, either use brackets, or put it between "code" tags and use preview to make sure it lines up. 
March 30th, 2009, 10:03 AM  #3 
Newbie Joined: Mar 2009 Posts: 3 Thanks: 0  Re: Algebra problem! 
March 30th, 2009, 12:20 PM  #4 
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: Algebra problem!
"Belongs to Q" means "is rational" Now, the "5" is irrelevant, because a rational number minus five is still rational, and an irrational number minus five is still irrational. This number can be rational if: (a) 2x+4 = 0, or (b) 2x+4 is some nonzero rational number times . This gives: (a) x = 2, or (b) an infinite number of answers, for example x=. 
March 31st, 2009, 06:18 AM  #5 
Newbie Joined: Mar 2009 Posts: 3 Thanks: 0  Re: Algebra problem!
THX for help! 

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