a = 2 (slider from -5 to 5, step 1)
c = 3
f(x) = (x^(2) * (9 - (x - a)^(2)))
g: x = 2
b(x, y) = (9 * y^(2)) - ((x^(2) + y^(2)) * (y - a)^(2))
A, B, C = Extremum(f)
f'(x) = f'(x)
xe: (1 / 2 * (sqrt(19) + 3))
xv: (1 / 2 * ((-sqrt(19)) + 3))