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Math Help - Integer Confusion

  1. #1
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    Integer Confusion

    Text book question is.....Do (-2) "squared" and -2 "squared" have the same value?
    -I have written "squared" because can't see how to type in "2" in exponent form.-
    The text book answer is "no" and list -4 and 4 for the individual answers.
    Why is this so?
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  2. #2
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    (-2)^2=(-2)(-2)=4
    -2^2=-(2^2)=-4
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  3. #3
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    Smile many thanks plato re integer confusion

    thanks heaps plato, the first line i can follow but why/where did the second line brackets magicly appear from.
    Also i guess that ^ means "exponent" - cheers.
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  4. #4
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    Quote Originally Posted by DUMPKOFF View Post
    thanks heaps plato, the first line i can follow but why/where did the second line brackets magicly appear from.
    Also i guess that ^ means "exponent" - cheers.
    Yes, ^ means exponent. Plato is following "order of operations." Many learn this as PEDMAS or BODMAS. The in the absence of parenthesis the process of taking the exponent comes first, so -2^2 = -4. Plato inserted the parenthesis to make it clear that the exponent operation takes precedence in this expression.

    -Dan
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  5. #5
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    Talking got it now

    Thanks again Dan. I never did hear of bodmass but it kinda sound like another word for my (expanding) paunch!! Seriously now, the light has come on, -2^2 means negative.(stop) two x two. Which = 4 with the negative shoved in front(where it was anyway on the other side of the equals). And it does not mean, negative two, x two - which was how I was reading it at first. Now I can rest in piece.
    Cheers
    Remember- Smith and wesson beats four aces!!! - everytime.
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