Question

is V25 = ±5 always? why?

Answer 1

V25 = \[\sqrt{25}\]

Answer 2

actually it denotes positive square root of 25

Answer 3

so answer will be 5

Answer 4

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

Answer 5

Because 5² = (=5)² = 25

Answer 6

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

Answer 7

(=5)^2? interesting

Answer 8

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

Answer 9

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

Answer 10

It's basic Pre Algebra!

Answer 11

Because 5² = (-5)² = 25

Answer 12

yup. but why? hm..

Answer 13

x^2= x* x

Answer 14

25= 5*5
and 25 =(-5)* (-5)

Answer 15

i know that. i mean... argh. i cant speak english very well. but i think that's enough thanks for your hardwork xD