[zithtar]

Not the OP, but here's an idea:

A math-centric piece of software that allows you to write in equations via a stylus, then converts these to working equations. So, you write down the quadratic equation and can define in the software what a and b are, then solve for x.

There has to be something similar to this already.

[planetguy]

You'd want it just as an interface for Mathematica or similar programs. I did a bit of googling and can't find anything that exists.