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Math Help - Adding and sub fractions

  1. #1
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    Adding and sub fractions

    \frac{s}{2s-6}+\frac{1}{4}-\frac{3s}{4s-12}
    Okay i know that LCD is 4(s-3) but i can't see how i get the answer of \frac{-3}{4(s-3)} I cannot see how I get -3 Please help me.
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  2. #2
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    Quote Originally Posted by Itsbaxagain View Post
    \frac{s}{2s-6}+\frac{1}{4}-\frac{3s}{4s-12}
    Okay i know that LCD is 4(s-3) but i can't see how i get the answer of \frac{-3}{4(s-3)} I cannot see how I get -3 Please help me.
    \frac{s}{2s-6}+\frac{1}{4}-\frac{3s}{4s-12} =

    \frac{s}{2(s-3)}+\frac{1}{4}-\frac{3s}{4(s-3)} =

    \frac{2s}{2 \cdot 2(s-3)}+\frac{1 \cdot (s-3)}{4(s-3)}-\frac{3s}{4(s-3)} = \frac{2s + s - 3 - 3s}{4(s-3)} =

    \frac{-3}{4(s-3)}
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