Square Root Function

A radical function in which the index of the radical is 2 is also called a square root function. The parent function of the square root function family is f(x) = sqrt(x).

Because the square root of a negative number is not a real number, the radicand in a square root function must be non-negative. Therefore, the domain of f(x)=sqrt(x) can be defined as all real numbers greater than or equal to 0. The square root of a non-negative number is also non-negative, which leads to the range of this function being all real numbers greater than or equal to 0. f(x)=sqrt(x) ↙ ↘ cc Domain & Range x≥ 0 & y≥ 0