anonymous
  • anonymous
is V25 = ±5 always? why?
Mathematics
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
V25 = \[\sqrt{25}\]
anonymous
  • anonymous
actually it denotes positive square root of 25
anonymous
  • anonymous
so answer will be 5

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lgbasallote
  • lgbasallote
@akash123 you're talking about principal square roots...
anonymous
  • anonymous
Because 5² = (=5)² = 25
anonymous
  • anonymous
yes it's... but if anyone use this symbol of sqrt then it implies positive sqrt only eg as we write sqrt(sin^2x) = I sinx I
lgbasallote
  • lgbasallote
(=5)^2? interesting
anonymous
  • anonymous
I think it's a convention only and moreover it's frequently used in calculus
anonymous
  • anonymous
So YES, the even root always yield 2 results :)
anonymous
  • anonymous
It's basic Pre Algebra!
anonymous
  • anonymous
Because 5² = (-5)² = 25
anonymous
  • anonymous
yup. but why? hm..
anonymous
  • anonymous
x^2= x* x
anonymous
  • anonymous
25= 5*5 and 25 =(-5)* (-5)
anonymous
  • anonymous
i know that. i mean... argh. i cant speak english very well. but i think that's enough thanks for your hardwork xD

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