Square root of 81

Sqrt(81). Find the square root of 81 or any other real number, positive or negative. Here are the answers to questions like: Square root of 81 or what is the square root of 81?

What is square root? Definition of square root

A square root of a number 'x' is a number y such that y² = x, in other words, a number y whose square is y. For example, 9 is the square root of 81 because 9² = 9•9 = 81, -9 is square root of 81 because (-9)² = (-9)•(-9) = 81. When writing math, people often use sqrt(x) to mean the square root of x. Read more about square root here: Square Root - Wikipedia and here: Square Root - Wolfram

Square Symbol?

Here is the square root symbol. It is is denoted by √, known as the radical sign or radix.

Square root of values around 81