Graphing square root and stating its domain and range

Question

Assignment:

Graph each equation and state its domain and range.

1)  g(x)= x² + 2

2) f(x)= x ² - 4

3) y= 2x²  +  3

Graph each square root and state its domain and range.

1) g(x) =    √ x  - 1

2) f(x) = √x + 1

Provide complete and step by step solution for the question and show calculations and use formulas.