a = 1 (slider from -5 to 5)
b = 0 (slider from -5 to 5)
c = -5 (slider from -5 to 5)
f(x) = (a * x^(2)) + (b * x) + c
eq1: x^(2) + y^(2) = 25
A, B, C, D = Intersect(f, eq1)