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febylailani

  • 2 years ago

is V25 = ±5 always? why?

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  1. febylailani
    • 2 years ago
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    V25 = \[\sqrt{25}\]

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

  3. akash123
    • 2 years ago
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    so answer will be 5

  4. lgbasallote
    • 2 years ago
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    @akash123 you're talking about principal square roots...

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

  6. akash123
    • 2 years ago
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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

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

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

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

  10. Chlorophyll
    • 2 years ago
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    It's basic Pre Algebra!

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

  12. febylailani
    • 2 years ago
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    yup. but why? hm..

  13. akash123
    • 2 years ago
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    x^2= x* x

  14. akash123
    • 2 years ago
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    25= 5*5 and 25 =(-5)* (-5)

  15. febylailani
    • 2 years ago
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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

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