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www.quora.com/What-is-the-square-root-of-4

You asked: * What is [math]\sqrt{-4}[/math] (the square root of –4)? * Note: a person could ask “What are the square roots of –4?” There are actually two such square roots, → one simpler (2i) → the other slightly more complex (-2i). * But since th...

answers.yahoo.com/question/index?qid=20081231145658AAdZ2yi

the square root of 4 is not -2 Or 2 it's 2 .... square root is always positive... unless the question asked for the principal AND NEGATIVE SQUARE ROOT Ryan. obviously you just copied everyone else... I have a degree in pure math I will find a link if you dont believe me... lots of people on Yahoo answers dont know math apparently

mathcentral.uregina.ca/QQ/database/QQ.02.06/marybeth1.html

2 and -2 are both square roots of 4 since 2 2 = 4 and (-2) 2 = 4. Thus, if the question is to find the square roots of 4, the answer is ±2. This can cause confusion if you want to specify one of the roots, either 2 or -2. To make this possible the surd symbol, √, is reserved for the positive square root.

www.reference.com/math/square-root-negative-4-f7b7de6d80729ff4

Technically, the square root of a negative number cannot be taken, but if imaginary numbers are allowed, the answer would be 2i. It can be tempting for those people just learning how to deal with square roots to assume the square root of -4 would be -2, but this does not work because when -2 is multiplied by -2, the result is 4 rather than -4.

en.wikipedia.org/wiki/Square_root

The principal square root function f(x) = √ x (usually just referred to as the "square root function") is a function that maps the set of nonnegative real numbers onto itself. In geometrical terms, the square root function maps the area of a square to its side length.. The square root of x is rational if and only if x is a rational number that can be represented as a ratio of two perfect...

www.answers.com/Q/What_is_the_square_root_of_4

The answer is 2 on the square root of 3, all divided by 4. You come to this conclusion by multiplying the square root of three quarters by the square root of four divided by the square root of ...

byjus.com/maths/square-root-of-4

What is the square root of 4? Considering the above example, +2 and -2 are square roots of 4 because 2 2 = (-2) 2 = 4. A real number which is non negative has a unique nonnegative square root. It is called principal square root denoted by √a. √ is called the radical symbol or radix and in this example the principal square root of 4 is 2 ...

www.answers.com/Q/What_is_the_square_root_of_four_ninths

The answer is 2 on the square root of 3, all divided by 4. You come to this conclusion by multiplying the square root of three quarters by the square root of four divided by the square root of ...

www.quora.com/Whats-the-square-root-of-4

It is +2 or since (+2)*(+2 ) gives. If you think that it would be (-2) also then you are wrong because root of a positive rational number is always positive number. [For brief knowledge read the instructions below:] Let the square root of four be ...

www.mathspage.com/square-roots-simplified/solved/what-is-the-square-root-of-4

For example, 2 is the square root of 4, because 2x2=4. Only numbers bigger than or equal to zero have real square roots. A number bigger than zero has two square roots: one is positive (bigger than zero) and the other is negative (smaller than zero). For example, 4 has two square roots: 2 and -2. The only square root of zero is zero.