The expression "√8" represents the square root of 8. This means it is a number that, when multiplied by itself, equals 8. The square root of 8 can be simplified to 2√2, since 2 multiplied by itself gives 4, and 4 multiplied by 2 gives 8. In decimal form, √8 is approximately 2.83. Square roots are commonly used in mathematics, particularly in geometry and algebra, to solve problems involving areas and lengths. Understanding square roots is essential for working with quadratic equations and Pythagorean theorem.