Math.sqrt()

Summary

The Math.sqrt() function returns the square root of a number, that is

$$\forall x \geq 0, \mathtt{Math.sqrt(x)} = \sqrt{x} = \text{the unique} \; y \geq 0 \; \text{such that} \; y^2 = x$$

Syntax

Math.sqrt(x) 

Parameters

x

A number.

Description

If the value of number is negative, sqrt returns NaN.

Because sqrt is a static method of Math, you always use it as Math.sqrt(), rather than as a method of a Math object you created.

Examples

Example: Using Math.sqrt

Math.sqrt(9); // 3
Math.sqrt(2); // 1.414213562373095

Math.sqrt(1);  // 1
Math.sqrt(0);  // 0
Math.sqrt(-1); // NaN

Specifications

Browser compatibility