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Math Help - solve

  1. #1
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    solve

    where do you start with this problem
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by rj2001 View Post
    where do you start with this problem
    Here
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  3. #3
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    Yes, the equation does not has solution, that is all
    Last edited by Krizalid; June 25th 2007 at 03:41 AM.
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    in retrospect, i'm thinking we could divide by z - 9 to get the equation z - 7 = 2 and avoid that annoying quadratic. apparently when i did this problem i was concerned about z - 9 being 0, but now i see that that can't be the case, since the original fractions wouldn't be valid in the first place
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  5. #5
    Bar0n janvdl's Avatar
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    Yeah i agree, it simply doesnt have a solution.
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  6. #6
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by janvdl View Post
    Yeah i agree, it simply doesnt have a solution.
    right, because z can't be 9
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  7. #7
    MHF Contributor red_dog's Avatar
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    z\neq 9.
    Then \displaystyle \frac{z-7}{z-9}=\frac{2}{z-9}\Leftrightarrow \frac{z-7}{z-9}-\frac{2}{z-9}=0\Leftrightarrow \frac{z-9}{z-9}=0\Leftrightarrow 1=0, false!
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