I found an answer from en.wikipedia.org

**Square root** - Wikipedia

In mathematics, a square root of a number a is a number y such that y^{2} = a; in
other words, ... For example, the principal **square root of 9** is 3, which is denoted
by √9 = 3, because 3^{2} = 3 · 3 = 9 and 3 is nonnegative. The term (or number) ...

For more information, see **Square root** - Wikipedia

I found an answer from www.britannica.com

**Square root** | mathematics | Britannica.com

Square root, in mathematics, a factor of a number that, when multiplied by itself,
gives the original number. For example, both 3 and –3 are **square roots of 9**.

For more information, see **Square root** | mathematics | Britannica.com

I found an answer from en.wikipedia.org

nth **root** - Wikipedia

In mathematics, an nth root of a number x, where n is usually assumed to be a
positive integer, is a number r which, when raised to the power n yields x: r n = x ,
{\displaystyle r^{n}=x,} {\displaystyle r^{n}=x,}. where n is the degree of the root. A
root of degree 2 is called a square root and a root of degree 3, a cube root. ... −3
is also a **square root of 9**, since (−3)^{2} = 9.

For more information, see nth **root** - Wikipedia

I found an answer from answers.yahoo.com

whats the **square root** of 1\**9** and **9**\4? | Yahoo Answers

Getting the **square root** is figuring out what that number was before it was
multiplied it by itself. For 1/**9** the **square root** of 1 is 1 and the square ...

For more information, see whats the **square root** of 1\**9** and **9**\4? | Yahoo Answers

I found an answer from answers.yahoo.com

**Square root of 9** plus the square root of 16? | Yahoo Answers

Things under the **square root** have the same priority in the order of operations as
things in parenthesis. Take the **square root** of each number ...

For more information, see **Square root of 9** plus the square root of 16? | Yahoo Answers

I found an answer from www.quora.com

**What is the square root of 9**? - Quora

**Square root** means a number that produces a specified quantity when multiplied
by itself. That may sound confusing but here are some examples to help.

For more information, see **What is the square root of 9**? - Quora

I found an answer from www.quora.com

Is the **square root of 9** = 3 or +-3? - Quora

Mathematics is really a language to communicate ideas. And like any other language, it only works if the words you use mean the same things to you that they ...

For more information, see Is the **square root of 9** = 3 or +-3? - Quora

I found an answer from mathworld.wolfram.com

**Square Root** -- from Wolfram MathWorld

Note that any positive real number has two square roots, one positive and one
negative. For example, the **square roots of 9** are -3 and +3 , since (-3)^2=(+3)^2=
9 ...

For more information, see **Square Root** -- from Wolfram MathWorld