Math.sqrt()

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

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

x

A number.

The square root of the given number. If the number is negative, NaN is returned.

If the value of x is negative, Math.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 (Math is not a constructor).

• Math.cbrt()
• Math.exp()
• Math.log()
• Math.pow()