When the definition of a function involves a square root the

When the definition of a function involves a square root, the function is undefined for any value that would make the expression under the radical

Solution

A function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output. An example is the function that relates each real number x to its square x².

f(x) = k *sqrt(x)

bt x is non-negative