**According to Math Warehouse, the square root of eight is 2.82.** The square root of eight function can be simplified by factoring out the square of the whole number and rewriting the equation of the square root of four times the square root of two.

The function can be simplified further by writing the square root of four as two. The function then reads as two times the square root of two. The square root of a number, represented by the variable a, is another number, represented by the variable b; that number when multiplied by itself is equal to a, as in b times b equals a. For the number eight, the formula is 2.82 times 2.82 equals eight.