Square Root Of X Squared Does Not Equal X?

Discussion in 'General Discussion' started by Blade7, Oct 31, 2006.

  1. 614-TM

    614-TM Well-Known Member

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    john.
    I'm thinking.
    You, myself and a few others are the only ones in here that have taken math classes > algebra.
     
  2. RebelYell101

    RebelYell101 Well-Known Member

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    No, I went to Algebra a year early. :P, I'm in trig now. -x^2 is not an imaginary number...

    -9^2=81

    Now, -x^1/2 is an imaginary number.

    (i.e. anything raised to the half power, is the same as taking a square root)
     
  3. Lennox

    Lennox Well-Known Member

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    wrong. -9^2 = 81 not -81. Do it the long way. -9 x -9 = 81

    Your caluculator gives you the wrong answer when it comes to squaring a negative.
     
  4. johndapunk FTW

    johndapunk FTW Senior Member

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    go you? you in pre-calculus as a freshman by any chance?
    would like to see the answer...
     
  5. RebelYell101

    RebelYell101 Well-Known Member

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    It isn't a compitition. Although, you can't go to pre-cal as a freshman, you only would have one more math to be offered to you in highschool and you need three...(or four?) to graduate. Anyways, I was in Algebra in middle school. Either way, I don't believe you. Lol. If you use a real calculater...like a scientific one, then it will work. -9^2=81.
     
  6. johndapunk FTW

    johndapunk FTW Senior Member

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    Don't believe what? that sqrt(x^2) != x? or that im in pre-calculus as a freshman?
    http://img165.imageshack.us/img165/9485/fridayze7uj8.png
    7th - algebra 1
    8th - geometry
    summer '06 - algebra 2
    now - pre-calc
    10th - calc ab
    11th - calc bc (or ab and bc in same year)
    12th - dual-enrole -> differential equations
    if ab and bc in same year -> Maxtrix Theory

    Mm k.
     
  7. RebelYell101

    RebelYell101 Well-Known Member

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    I know the math. I don't believe you are in pre-cal as a freshman. Still don't. But, whatever floats your boat. :unsure:
     
  8. johndapunk FTW

    johndapunk FTW Senior Member

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    You mean the link to my schedule wasn't enough fact?
     
  9. RebelYell101

    RebelYell101 Well-Known Member

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    Nope.
     
  10. nuetronist

    nuetronist Well-Known Member

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    No, It wouldn't work even if it was a scientific calculator...because in the statement (?) -9^2, the power 2 is being applied to only the 9, so it would be -(9^2)=-9^2 for a scientific calculator. If you want to make the answer come out as 81, you would put it in brackets so: (-9)^2

    I hope thats right...im only in grade 9...
     
  11. RebelYell101

    RebelYell101 Well-Known Member

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    No. Get a scientific calculater. Type it in. -9^2. It will come out, to be 81. You are taking -9 and multiplying it by itself.
     
  12. johndapunk FTW

    johndapunk FTW Senior Member

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    Hmm, well I just guess your life is a bit insecure. Don't trust many people I would assume.
     
  13. RebelYell101

    RebelYell101 Well-Known Member

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    The main reason I don't believe you, is you're trying so hard to prove it to me. Why would you care what some kid thinks of you?
     
  14. johndapunk FTW

    johndapunk FTW Senior Member

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    Because I'm prideful; I worked hard to get where I am and I don't want to be downsized.
     
  15. RebelYell101

    RebelYell101 Well-Known Member

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    I didn't downsize you, you downsized me by saying, "Oh yea, I'm blah blah blah." Pride, is like the most useless character flaw...ever...
     

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