speed?

Blitz3D Forums/Blitz3D Beginners Area/speed?

I am doing an interpolation along a curve using the parabolic function(s):

y = ax^4+bx^3+cx^2+dx+e

I have figured out how to do it up to the ax^5..., but was wondering how far I would need to go to get a good balance between accuracy and speed...I do this about 21 times a loop and the data is accurately to the pixel represented at the ax^5.....