Here's something to start you off. The axis of symmetry for the parabola y = ax^2 + bx + c is x = -\dfrac{b}{2a} and if an x-intercept is at (-2, 0)...
steenis has shown wonderful acumen in posting great math help, and so it is with great pleasure that we announce the awarding of the MHB Math Helper...
I've installed this product on many vB sites without issue. As I said in another thread, I really recommend that you upgrade your vB. It's very old....