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Thread: [SOLVED] How do I get to answer this problem ?

  1. February 23rd 2006, 05:45 PM #1
    china_88
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    Smile [SOLVED] How do I get to answer this problem ?

    how do I solve this.... (a+b)squared - (c+d)squared ???

    Please help me by giving me the solution.... THANKS !!!
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  2. February 23rd 2006, 06:15 PM #2
    ThePerfectHacker
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    Quote Originally Posted by china_88
    how do I solve this.... (a+b)squared - (c+d)squared ???

    Please help me by giving me the solution.... THANKS !!!
    Remember the diffrence of two squares,
    x^2-y^2=(x+y)(x-y)
    Thus,
    (a+b)^2-(c+d)^2
    Over here x=a+b,y=c+d. Thus,
    (watch those signs
    [a+b+(c+d)][(a+b)-(c+d)]
    Thus,
    (a+b+c+d)(a+b-c-d).
    Q.E.D.
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