Question

Find the equation of the quadratic function with roots -8 and -6 and a vertex at (-7, -3).

Answer 1

Do you have access to a graphing calculator or software that can graph?

Answer 2

nope :(

Answer 3

Go there http://www.geogebra.org/webstart/geogebra.html

let it load. :)

Then type (x+8)*(x+6) in the input bar at the bottom.

You'll realize that you need to translate the graph down a little, so subtract off the required amount. Your equation will look like

(x+8)*(x+6) minus some number :)