Find the domain of the parent function below.
y=x^2
a. all real numbers
b. all positive numbers
c. all negative numbers
d. all real numbers except for 0

The domain is the set of possible input values, or the values of x, for a function. The domain of the quadratic parent function y=x^2 is all real numbers. A is correct.

The domain of the function is the answer A. all real numbers.