Question

How do you graph `y=sqrt(4-x)`?

Answer 1

When compared to the "mother"-function `y=sqrtx` two things have happened:

Explanation:

(1) The sign for `x` is negative. This means that the graph is mirrored in the `y`-axis.
(2) The `4` under the root-sign means the graph is displaced `4` to the right.
graph{sqrt(4-x) [-10, 10, -5, 5]}