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    This thread is hillarious. There are more people voting for the wrong answer than the right one. I haven't visited the maths forum for a while so I'm rather new to this mathematical democracy.
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    If you put -2^2 (which is the actual question) into a calculator, you get
    -4.

    Look I didn't even add some imaginary brackets!
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    (Original post by ssadi)
    If you put it in casio fx 990 ms calculator, it shows -4.
    I put this into a quantum supercomputer that was the first machine to beat both the Chess and Go world champions simultaneously. It told me that the answer is "kernel32.dll not found". (Only joking, computers of this sophistication don't use Windows.)

    Edit: Misplaced punctuation.
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    Do we really need four pages of heated debate to come to a conclusion that frankly should have been known, and that could have been reached with the sneaky use of a calculator?

    (evidently yes)
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    (Original post by Totally Tom)
    how the **** is this thread 3 pages long?

    OP: make your original question clearer, x^2 where x=-2 is (-2)^2 as has been said.

    LOL at the ******s saying "100% sure it's +4."

    fuxx sake, where did all the ******s come from all of a sudden?
    what i was about to say, not even face palm can describe the dismay here.

    edit: lol just saw the video adje.
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    (Original post by iainmacn)
    the OP doesn't need to give brackets - assuming it's a unary minus (i.e. turning 2 into -2) then it's higher priority than anything. BODMAS is great but it doesn't cover this.
    If there are no brackets then unless there is no further explanation -- and there was none until a later post -- there is no reason to assume that it is a unary minus.
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    lol - I cannot believe this thread has came up again - and with the same arguments.
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    this may need a bit of alteration according to your calculator, but try doing 0 - 2, getting the result, and then hitting the square button. On mine it gives 4, whereas rather worryingly entering -2 and then squaring gives -4
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    (Original post by iainmacn)
    this may need a bit of alteration according to your calculator, but try doing 0 - 2, getting the result, and then hitting the square button. On mine it gives 4, whereas rather worryingly entering -2 and then squaring gives -4
    just LOL


    0-2=-2

    (-2)^2=4

    -2^2=-(2^2)=-4.

    MORONS.
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    (Original post by harr)
    If there are no brackets then unless there is no further explanation -- and there was none until a later post -- there is no reason to assume that it is a unary minus.
    the fact that there was no operand before the minus sign means it is a unary minus - you can't subtract without there beign something to subtract from!
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    Nice troll OP, good job
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    I love it how everyone is so sure they are right!
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    (Original post by iainmacn)
    the fact that there was no operand before the minus sign means it is a unary minus - you can't subtract without there beign something to subtract from!
    I have never heard of that convention. I doubt many people here know it either. Where did you learn it? In my view there is something before it to subtract from: nothing.
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    There question is:
    (Original post by LearningMath)
    Thank you, to put it in context, im just substituing -2 into a quadratic for a graph, -2 into x^2. So it's positive for this then?
    You're putting x = -2 into x^2; i.e. if f(x) = x^2, then f(-2) = (-2)^2 = +4
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    (Original post by Mustard-man)
    There question is:You're putting x = -2 into x^2; i.e. if f(x) = x^2, then f(-2) = (-2)^2 = +4
    Ditto.

    If you put it in that context, then yeah it would be +4. Otherwise, if it was just left as -2^2, then it's really ambiguous.
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    -(2^2) would = -4

    -2^2 = 4.
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    Time for someone to close this thread down methinks.
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    brackets First
    Then Powers of
    division And
    multiplication Next
    Followed By addition
    And subtraction


    Argh!

    edit: Well that didn't turn out how I had hoped.
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    If it's (-2)^2 then its the same as (-2) x (-2) = +4
    If it's -2^2 then, you do powers first, so -(2^2) = -(4) = -4
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    I'll join in. The answer is -4.
 
 
 

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