Square Root Of X Squared Does Not Equal X?

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

  1. RebelYell101

    RebelYell101 Well-Known Member

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    If you take the square root of any real number squared. It will be the real number. For instance, 9^2=81. 81^1/2 =9. 'nuff said.
     
  2. ferret

    ferret Well-Known Member

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    On a calculator, you need parenthesis. In itself, -9x-9 is 81. Basic math. The calculator reads "-(9^2)," and as such gives it a negative outcome. However, -9^3 is -729. With a negative number, even exponents give positive outcomes, odd give negatives.

    To the original poster: I've proved myself to be a math geek enough. Ask your fuxing algebra teacher.
     
  3. }SoC{SainT

    }SoC{SainT Well-Known Member

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    Well, maybe I'm just a loser for being in the stupid IMP program that teaches nothing. They freaking changed our curriculum and held me back (for no good reason) and I FORGOT what I'd learned the previous year, that's how stupid the new stuff is. Which is why I never continued with math this year. It's good for people who don't speak english as a first language, but I know how to read, I know how to do story problem, I DON'T know how to do the equations or what they're for.

    Sorry, that was just a ridiculous rant. I'm still upset with our school... Thankfully, I'm a senior :D.

    Continue on with your geniusness o great ferret
     
  4. RebelYell101

    RebelYell101 Well-Known Member

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    Not the guy I quoted, but one of his quotes. The Square Root of -81, IS infact possible. -81^1/2 would be 9i. ;)
     
  5. }SoC{SainT

    }SoC{SainT Well-Known Member

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    *drools stupidly* IMP confused my already confused mind. I'm gonna give up and just read what ya'll have to say, lol. I think I'm learning more here than I did in a whole year of math.

    But... what's 9i mean? lol
     
  6. johndapunk FTW

    johndapunk FTW Senior Member

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    You would normally learn Bases in a computers class, since that is the only logical place you would need them (base 2 or Binary, base 8 or Octal, base 16 or Hexidecimal.)
    One thing the base does is tell you how many digits (or letters) you have in your system. For instance, Base 2 has 0 and 1; base 8 has 0,1,2...7; base 10 (decimal) has 0,1,2...9; and hex has 0,1,2...9,A,B...F. I can't really think of a clear cut definition for it, but I'm sure somebody can. I'll give you a steps on how to convert it from Base 10 to Base anything.

    Number in base 10: 284 base 6: ?
    Step 1: 284 / 6 = 47 with remainder 2
    Step 2: 47 / 6 = 7 with remainder 5
    Step 3: 7 / 6 = 1 with remainder 1
    Step 4: 1 / 6 = 0 with remainder 1
    (note: continue these steps under the dividend = 0.)
    Put those remainders together and you get: 1152 ...
    So, the answer in Base 6: 1152 (or in Byte form: 00001152)

    To kind of scope out how base 6 1152 = base 10 284:

    1 1 5 2
    6^3 + 6^2 + 6^1 + 6^0 or (6^3)*1 + (6^2)*1 + (6^1)*5 + (6^0)*2

    Which in base 10 = 216 + 36 + 30 + 2 Which most definally = 284!!!
     
  7. [.Xero.]

    [.Xero.] Well-Known Member

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    It should work for all numbers *LEGIT*, show me a number that doesn't work...

    *NUMBER NOT INTEGER*
     
  8. johndapunk FTW

    johndapunk FTW Senior Member

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    Xero, what grade are you in? Like 7th? Have you had Algebra 2 yet?
     
  9. 614-TM

    614-TM Well-Known Member

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    Imaginaries are easy.

    sqr(-8) = 2i(sqr(2))

    In dealing with negatives all you have to do is pull out an i.
    i for imaginary.
    Go figure.

    This is basic algebra:

    Any number squared will be positive.
     
  10. Common

    Common Well-Known Member

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    -x^2 is an imaginary number or w.e but the square root of x^2 IS x because x^2 is x*x which square root takes out the X
     
  11. EzButtonjp

    EzButtonjp Well-Known Member

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    sounds like your teacher is lying to you
     
  12. johndapunk FTW

    johndapunk FTW Senior Member

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    how is -x * -x an imaginary number?
     
  13. madmav

    madmav Well-Known Member

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    What the ---- are you guys talking about.
    :|
     
  14. X-5

    X-5 Well-Known Member

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    negative square root is imaginary number
     
  15. Jammie

    Jammie Well-Known Member

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    (Note: (rt) means square root)It should work out that (rt)x^2 = x. If you work it out using the index rules: that square root of a number is the same as that number to the power of a half, and that (x^n)^m = x^m*n then (rt)x^2 = (x^2)^1/2 = x^1 = x. Additional maths does come in handy :)...except for logarithms...
     

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