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febylailani

is V25 = ±5 always? why?

  • one year ago
  • one year ago

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  1. febylailani
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    V25 = \[\sqrt{25}\]

    • one year ago
  2. akash123
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    actually it denotes positive square root of 25

    • one year ago
  3. akash123
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    so answer will be 5

    • one year ago
  4. lgbasallote
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    @akash123 you're talking about principal square roots...

    • one year ago
  5. Chlorophyll
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    Because 5² = (=5)² = 25

    • one year ago
  6. akash123
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    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

    • one year ago
  7. lgbasallote
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    (=5)^2? interesting

    • one year ago
  8. akash123
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    I think it's a convention only and moreover it's frequently used in calculus

    • one year ago
  9. Chlorophyll
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    So YES, the even root always yield 2 results :)

    • one year ago
  10. Chlorophyll
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    It's basic Pre Algebra!

    • one year ago
  11. Chlorophyll
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    Because 5² = (-5)² = 25

    • one year ago
  12. febylailani
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    yup. but why? hm..

    • one year ago
  13. akash123
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    x^2= x* x

    • one year ago
  14. akash123
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    25= 5*5 and 25 =(-5)* (-5)

    • one year ago
  15. febylailani
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    i know that. i mean... argh. i cant speak english very well. but i think that's enough thanks for your hardwork xD

    • one year ago
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