Can someone help me please? The value of the square is 145 thousandths

The domain consists of a pre image, and the range consists of the image. when we are looking at f(x), we are looking at the range. when we are looking at x, we are looking at the domain. when the range is 4, the x value is 2. 

so, when f(x) is 4, the value of x is 2.