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Math Help - fractions common demoninator

  1. #1
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    fractions common demoninator

    whats the LCD for

    b 2b
    -- --
    (b+5) (b-5)


    and

    1 3
    -- --
    2xy x^2





    and


    1 5
    -- --
    12a^2b 18b^2

    and


    6 4x
    -- --
    x-3 (x-3)^2






    there all two fractions by the way i have no idea what the sign is for fractions on the internet
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  2. #2
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    Quote Originally Posted by elfen_lied View Post
    whats the LCD for

    b 2b
    -- --
    (b+5) (b-5)

    and

    1 3
    -- --
    2xy x^2

    and

    1 5
    -- --
    12a^2b 18b^2

    and


    6 4x
    -- --
    x-3 (x-3)^2


    there all two fractions by the way i have no idea what the sign is for fractions on the internet
    Hello,

    you asked for the LCD only: If you can't factor the denominators the LCD is the product of both denominators:

    \frac{b}{b+5},\ \frac{2b}{b-5}\ \underbrace{\longrightarrow}_{denominator} (b+5)(b-5)=b^2-25

    \frac{1}{2xy},\ \frac{3}{x^2}\ \underbrace{\longrightarrow}_{denominator}2x^2y

    \frac{1}{12a^2 b},\ \frac{5}{18 b^2}\ \underbrace{\longrightarrow}_{denominator}36a^2 b^2

    \frac{6}{x-3},\ \frac{4x}{(x-3)^2}\ \underbrace{\longrightarrow}_{denominator} (x-3)^2

    EB
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