febylailani
is V25 = ±5 always? why?



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

akash123
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actually it denotes positive square root of 25

akash123
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so answer will be 5

lgbasallote
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@akash123 you're talking about principal square roots...

Chlorophyll
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Because 5² = (=5)² = 25

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

lgbasallote
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(=5)^2? interesting

akash123
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I think it's a convention only and moreover it's frequently used in calculus

Chlorophyll
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So YES, the even root always yield 2 results :)

Chlorophyll
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It's basic Pre Algebra!

Chlorophyll
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Because 5² = (5)² = 25

febylailani
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yup. but why? hm..

akash123
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x^2= x* x

akash123
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25= 5*5
and 25 =(5)* (5)

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