Draw a graphic from an equation

Hi, i actually realize an app and i need to draw some equations like y = ax² + bx + c = 0 or
y = ax³ + bx² + cx + d = 0.
What's the best and the easiest way to do that?
i saw examples with cos, sin,... but it's not really what i'm look for i guess...
Thanks.

Try to use a lambda function, something like:

new FunctionSeries( x => a*x*x*x + b*x*x + c*x + d, .... )