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Math Help - Checking

  1. #1
    Newbie
    Joined
    Aug 2009
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    20

    Checking

    The instructions are to multiply
    (w+1/4)…stands for w + one fourth (w+1/5)…w + one-fifth
    (w + 1/4) (w + 1/5)
    w (w+1/5) + 1/4(w+1/5)
    w* w +w*1/5 + 1/4 * w + 1/4 *1/5
    w^2 + 1/5x +1/4x + 1/20
    w^2 + 9/20x + 1/20
    I fell I have done something wrong here?

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  2. #2
    MHF Contributor
    Joined
    Sep 2008
    From
    West Malaysia
    Posts
    1,261
    Quote Originally Posted by Brama Bull View Post
    The instructions are to multiply
    (w+1/4)…stands for w + one fourth (w+1/5)…w + one-fifth
    (w + 1/4) (w + 1/5)
    [SIZE=3]w (w+1/5) + 1/4(w+1/5)
    w* w +w*1/5 + 1/4 * w + 1/4 *1/5
    w^2 + 1/5x +1/4x + 1/20
    w^2 + 9/20x + 1/20
    I fell I have done something wrong here?
    (w+\frac{1}{4})(w+\frac{1}{5})

    =w^2+\frac{w}{5}+\frac{w}{4}+\frac{1}{20}

     <br />
=w^2+\frac{9}{20}w+\frac{1}{20}<br />

    There is a mistake with the variable ... should be w and not x.
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