Square root of a number is another number which can be multiplied by itself and
gives the original number. Square root is denoted by radical sign as vx = y ,
or in a exponent notation as x
1/2 = y . For example, v9 = 3 , 9
1/2
= 3 , since 3 * 3 = 9.
Every positive number x has 2 square roots, one is +vx and the other is -vx .