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Math Help - I'm not understanding this problem

  1. #1
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    I'm not understanding this problem

    please help. This is the problem What is 39 squared?
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Angel King View Post
    please help. This is the problem What is 39 squared?
    39 squared = 39^2 = 39 * 39 = 1521

    -Dan
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by Angel King View Post
    please help. This is the problem What is 39 squared?
    I think we would be interested in why you find this a problem?

    Is it that you don't know what 39 squared means? ( it means 39 times itself
    which is 39x39).

    Or that you cant do the multiplication?

    RonL
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  4. #4
    Junior Member AlvinCY's Avatar
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    There are many other ways to attack the problem, the box method which is long and tedious, simple multiplication, calculator... otherwise if you know the perfect square expansion:

    39^2 = (40 - 1)^2... mainly cos 40 and 1 and nice numbers to work with.
    = (40)^2 - 2*(40)*(-1) + 1^2
    = 1600 + 80 + 1
    = 1681
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  5. #5
    Grand Panjandrum
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    Quote Originally Posted by AlvinCY View Post
    There are many other ways to attack the problem, the box method which is long and tedious, simple multiplication, calculator... otherwise if you know the perfect square expansion:

    39^2 = (40 - 1)^2... mainly cos 40 and 1 and nice numbers to work with.
    = (40)^2 - 2*(40)*(-1) + 1^2
    = 1600 + 80 + 1
    = 1681
    Except we do hope to get the right answer

    RonL
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  6. #6
    Junior Member AlvinCY's Avatar
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    Sorry. Change of signs... it was nearly 3 am wen I posted it, what I meant was in fact:

    39^2
    = (40 - 1)^2
    = 40^2 - 2 \times 40 \times 1 + 1^2
    = 1600 - 80 + 1
    = 1521

    Which IS the correct answer
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