The domain refers to the independent variable, and the range is the dependent variable. If there are two places, one is to put the independent variable, that is, the value of x, and get the function value through the function f(x), that is, the value of y, and the other place is to put the value of y, and xy corresponds.

Usually, you will be asked to find the domain of a function. If the function is interesting, the denominator is not equal to zero, or the formula under the quadratic root sign >; =0

The domain of the first question is that x is not equal to -2 or the range of 0 is not equal to 0. Briefly, there should be simplified graphics in the book.

The definition of the second question is greater than or equal to-1 and less than 0.

The domain of the third question is: first, if the denominator is not 0, x is not equal to plus or minus 4, and then the formula in the root sign is greater than or equal to 0, then the root formula is needed.

I hope I can help you. If you are not clear, you can ask again.