- A number is a square root of the product resulting from the number times itself
- Example: 2 is a square root of 4 since 2*2=4
- In notation form, the square root of 4 is written \sqrt { 4 } or \sqrt [ 2 ]{ 4 } , and 4 is the radicand under the radical symbol with an understood index of 2 if no index value is present
- Application: Finding the hypotenuse of a right triangle given leg lengths under the Pythagorean Theorem
- Application: Finding the distance between two points on a coordinate plane with the Distance Formula
- Application: Finding the solutions to quadratic equations