# Help with functions

1. Oct 14, 2006

### HELP_ME123

one of my homework questions is asking to find the equation in standard form when given the roots and one intersecting point. The roots are -2 and 8 and
point given is -1,16. any help much appreciated.

2. Oct 14, 2006

Is this a quadratic? $$f(x) = a(x - h)^2 + k$$

Last edited: Oct 14, 2006
3. Oct 15, 2006

### HallsofIvy

Staff Emeritus
So you know it must be of the form f(x)= a(x-8)(x+2) in order to have those roots. What must a be so that f(-1)= 16?

4. Oct 15, 2006

### HELP_ME123

it could be its. a function, if you know what that is. for every x value there is only one y value, yes it is possible it's a quadratic.

5. Oct 15, 2006

### HallsofIvy

Staff Emeritus
I believe courtrigrad knows what a function is! I suspect his original response was asking whether you know what a quadratic is!:rofl: