# Graph and inverse

1. Dec 15, 2004

### aisha

I have a graph that looks like a C its a parabola and it has a vertex of -2,0 My question says to evaluate f(2) f(-2) f^-1(0) and f^-1(2) how do I do this? I sketched the inverse already now what? Please help me

2. Dec 15, 2004

### Sirus

Find the values of $y$ when $x$ equals each of those values for each graph. For example, find the $y$ coordinate for the point on $f(x)$ where $x=2$ to evaluate $f(2)$. It may be useful to find the equations of the functions first. Try using the data and the graph to find the equations.

3. Dec 16, 2004

### delton

Another thing: in an inverse the x and y values are switched. This fact makes drawing even the most complcated graph's inverses a breeze.

4. Dec 16, 2004

### HallsofIvy

Staff Emeritus
Darned if I know! You will need to know more about the function than just that its graph "looks like a C its a parabola and it has a vertex of -2,0". From that, you can only say that f-1(0)= -2 since the inverse function swaps x and y values.
f(2) and f-1 depend upon other information about the graph.

5. Dec 17, 2004

### aisha

LOL thanks guys I got it, I found the coordinates of f(x) and then switched them to get the inverse. Then I evaluated I hope this is right.

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