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Math Help - Rational Expressions help!

  1. #1
    Newbie
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    Jun 2008
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    Rational Expressions help!

    how to solve for this one

    1)2x+y/x-y - 3x-y/x+y

    2)x+3/2x^2-15x+18 + x-1/2x^2-13x+15

    ty in advance.
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  2. #2
    Super Member
    Joined
    Jun 2008
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    To add the expressions, try to get both expressions to have the same denominator. For instance, if I want to combine the following expressions:
    \frac{1}{x+2} + \frac{2}{x^2-4}

    I can make them have the same denominator if I look more closely:
    \frac{1}{x+2} + \frac{2}{(x+2)(x-2)}

    So, what I need to do to make them have the same denominator is simply to multiply the x-2 with the numerator and denominator of the first expression.
    \frac{1 \cdot (x-2)}{(x+2) \cdot (x-2)} + \frac{2}{(x+2)(x-2)}
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