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Math Help - please help get me started on this proof

  1. #1
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    please help get me started on this proof

    nevermind
    Last edited by FamilyGuy34; March 2nd 2010 at 09:34 PM.
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  2. #2
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    Quote Originally Posted by FamilyGuy34 View Post
    If a and b are rational numbers, b does not equal zero, and r is an irrational number, then a+br is irrational.
    Off the top of my head, this might be a way to start.

    1) Assume a+br is Rational.

    2) a + br = p/q where p and q are relatively prime integers.

    Okay, we have not yet used the fact that a and b are Rational. That might be the next thing to ponder.
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  3. #3
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    Quote Originally Posted by TKHunny View Post
    Off the top of my head, this might be a way to start.

    1) Assume a+br is Rational.

    2) a + br = p/q where p and q are relatively prime integers.

    Okay, we have not yet used the fact that a and b are Rational. That might be the next thing to ponder.
    What about this?

    If you substitute a and b with ratios of integers. Then solve for r?
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  4. #4
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    I really need help here I'm at a dead end
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