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Math Help - Why does (a + b)^2 = a^2 + ab + ab + b^2?

  1. #1
    Junior Member
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    australia
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    Why does (a + b)^2 = a^2 + ab + ab + b^2?

    What happened to the exponent rule where (a + b)^2 = a^2 + b^2

    Unless... unless that is only for (ab)^2

    ?

    I know that (a + b)(a + b) = a^2 + b^2 + ab + ab

    but ugghh this stuff just confuses me.
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  2. #2
    Junior Member
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    Mar 2009
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    Re: Why does (a + b)^2 = a^2 + ab + ab + b^2?

    (a+b)^2 does not equal a^2 + b^2

    (a+b)^2 = (a + b)(a + b) = a^2 + b^2 + ab + ab
    (ab)^2= (a^2)*(b^2)
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