Your

**domain**is all the legal (or possible) values of**x**, while the**range**is all the legal (or possible) values of y . So your**domain**is [−**2**,**2**] . Both the**2**and −**2**are included, because the stuff inside the**square root**is allowed to be zero.In this regard, what is the domain of x 9?

The

**domain**of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.Also Know, what is the domain of 9 x 2?

Explanation: y=

**9**−**x2**is an upside down parabola that has been shifted up**9**units. If it helps, you can rewrite the equation to make y=−**x2**+**9**. The**domain**of any parabola is all real**x**, or**x**∈R .How do you find the domain?

For this type of function, the

**domain**is all real numbers. A function with a fraction with a variable in the denominator. To**find the domain**of this type of function, set the bottom equal to zero and exclude the x value you**find**when you solve the equation. A function with a variable inside a radical sign.What is the range of 4 x 2?

Thus y=√

**4**−**x2**is the top half of the circle, which starts at (−**2**,0) , rises to (0,**2**) , then descends to (**2**,0) , showing its**range**of 0≤y≤**2**.