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Math Help - Help with these problems pleasse

  1. #1
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    Help with these problems pleasse

    1) 3n / n-1 - 1 / 3= -40/ 3n - 18


    2) 2x / x-2 + 15 / x^2 - 7x + 10 = 3/x-5

    im having trouble with these fractional equations . I'd appreciate any help. thanks a lot
    Last edited by uga75; February 20th 2011 at 10:41 AM.
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  2. #2
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    Quote Originally Posted by uga75 View Post
    1) 3n / n-1 - 1 / 3= -40/ 3n - 18
    \displaystyle \frac{3n}{n - 1} - \frac{1}{3} = - \frac{40}{3n - 18}

    First, factor out that denominator on the RHS.
    \displaystyle \frac{3n}{n - 1} - \frac{1}{3} = - \frac{40}{3(n - 6)}

    Now, to simplify this equation you will want to multiply both sides by the common denominator. In this case the denominators are n - 1, 3, and 3(n - 6). What is the common denominator of these three expressions?

    -Dan
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  3. #3
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    Quote Originally Posted by uga75 View Post
    2) 2x / x-2 + 15 / x^2 - 7x + 10 = 3/x-5
    Please use brackets: 2x / (x-2) + 15 / (x^2 - 7x + 10) = 3 / (x-5)

    Now factor (x^2 - 7x + 10)
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