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March 30th, 2009, 09:51 AM   #1
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Algebra problem!

I've got the following equation:

2?2x-5+4?2 belongs to Q

i need to get x = -2 but don't know how to solve it!
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March 30th, 2009, 10:01 AM   #2
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Re: Algebra problem!

What does "2?2x-5+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.
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March 30th, 2009, 10:03 AM   #3
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Re: Algebra problem!

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March 30th, 2009, 12:20 PM   #4
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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 non-zero rational number times .

This gives: (a) x = -2, or (b) an infinite number of answers, for example x=.
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March 31st, 2009, 06:18 AM   #5
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Re: Algebra problem!

THX for help!
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