The equation : x^2 = a where a is a positive real number has two solutions. An equation can have multiple solutions (even infinitely many solutions). Sqrt(x

The equation : x^2 = a where a is a positive real number has two solutions. An equation can have multiple solutions (even infinitely many solutions). Sqrt(x) is a function and as such it can have only one output for a given input. Functions don’t have solutions. By definition, sqrt(a) is the nonnegative solution of the equation x^2=a. Here, a can be zero.