SOLUTION: -2 and +2 are equal, if yes how ? we have tried this- (-2)x(-2)= 2x2 => (-2)^2=2^2 => (-2)=2 Is it correct ?

Algebra ->  Proofs -> SOLUTION: -2 and +2 are equal, if yes how ? we have tried this- (-2)x(-2)= 2x2 => (-2)^2=2^2 => (-2)=2 Is it correct ?      Log On


   

Question 1113462: -2 and +2 are equal, if yes how ?
we have tried this-
(-2)x(-2)= 2x2
=> (-2)^2=2^2
=> (-2)=2
Is it correct ?
Found 3 solutions by math_helper, Alan3354, ikleyn:
Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
(-2)x(-2)= 2x2
=> (-2)^2=2^2
=> (-2)=2
Is it correct ?
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In a way, it good that you are having trouble because +-2++%3C%3E++2+ !
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Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
-2 is not equal to 2.
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Squaring and then taking the square root can introduce extraneous "solutions."

Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
.
The fact that  x%5E2 = y%5E2  DOES NOT IMPLIES  that  x = y.



Example:  %28-2%29%5E2 = 2%5E2,   but -2 =/= 2.