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Thread: need help w/problem

  1. July 5th 2005, 04:32 PM #1
    Hayabusa
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    need help w/problem

    Evaluate: (a-2b)(a + 2b)

    My answer

    a^2 + -4b^2 = -4a^2b^2

    Does that look right?
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  2. July 5th 2005, 08:55 PM #2
    MathMan
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    The answer is just a^2 - 4b^2

    You cannot combine the a^2 and the -4b^2
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  3. July 6th 2005, 08:11 AM #3
    Hayabusa
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    thank you
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