f(x)=a(x-k)^2+m

a = 0.2 (slider from -5 to 5, step 0.1)
k = 6.3 (slider from -10 to 10, step 0.1)
m = 3.3 (slider from -50 to 50, step 0.1)
f(x) = a * (x - k)^(2) + m
S = Extremum(f)
A_2, A_1 = Root(f)
d: x = k