
Now you may not have heard the term constant function before, but intuitively

would think that, this is a function who that has a constant value, at all

values of the input. That's what graph A is. It's at the form y equals some

constant, C, let's say. Actually in this case it looks more like 3, so we'll

just write that. Linear functions you recognize. It's graph C right here. The

quadratic function is the parabola, graph F. The absolute value function, which

you saw in a problem set earlier in the course, is graph B. The cubic function

is graph D. And the square root function is graph E. Now you may not have seen

this graph before either. But as always, you can test points picking values of x

and then plugging them into the function to figure what the y coordinate should

be. The graph of this function is y equals the square root of x. So if x equals

0, y equals 0. If x equals 1, y equals 1. And we can see that moving further

over, if x equals 5, y equals just over 2.