a good place to start would be here. Does your text not have any examples of graphing functions?
http://www.wolframalpha.com/input/?i=plot+y%3D-x%5E2%2C+y%3D%E2%88%9A%28x-1%29
How do I graph these two problems?
y = −x2
g(x)= sqrt x-1
2 answers
A quadratic function
Graph the function g(x) = 4 − x2, and state the domain and range.
Solution
We plot enough points to get the correct shape of the graph.
See Fig. 11.10 for the graph. The domain is (−�‡, �‡). From the graph we see that the largest y-coordinate is 4. So the range is (−�‡, 4].
I can't paste the graph.
Graph the function g(x) = 4 − x2, and state the domain and range.
Solution
We plot enough points to get the correct shape of the graph.
See Fig. 11.10 for the graph. The domain is (−�‡, �‡). From the graph we see that the largest y-coordinate is 4. So the range is (−�‡, 4].
I can't paste the graph.