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The square root of a number, x, is the number that equals x when multiplied by itself.
The square root of 4 is 2, since 2 multiplied by itself equals 4.

Square root - Wikipedia


In mathematics, a square root of a number a is a number y such that y<sup>2</sup> = a; in other words, a number y whose square is a. For example, 4 and −4 are square ...

Square Root Calculator - Math.com


The Square Root Calculator will find the square root of the number you enter. ... Related Topic How to calculate square roots without a calculator ...

Understanding square roots | Radicals | Expressions with rational ...


Learn how square root means what number multiplied by itself will result in the given number.

Squares and Square Roots - Math is Fun


"Squared" is often written as a little 2 like this: square root of 9 is 3. This says "4 Squared equals 16" (the little 2 says the number appears twice in multiplying) ...

Understanding square roots | Square roots | Exponents, radicals ...


Learn how square root means what number multiplied by itself will result in the given number.

Square Root -- from Wolfram MathWorld


In common usage, unless otherwise specified, "the" square root is generally taken to mean the principal square root. The principal square root function sqrt(x)  ...

Square Root Calculator


Interactive square root calculator that can handle negative, imaginary, and complex numbers.

Square Roots: Introduction and Simplification - Purplemath


Introduces the square root. Covers basic terminology and demonstrates how to simplify terms containing square roots.

Mathwords: Square Root


Square Root. A nonnegative number that must be multiplied times itself to equal a given number. The square root of x is written or x<sup>½</sup>. For example, since 3<sup>2</sup> = 9.