a = 0.5 (slider from -5 to 5, step 0.1)
b = -1.6 (slider from -5 to 5, step 0.1)
c = -3.4 (slider from -5 to 5, step 0.1)
parabel: y = a * x^(2.0) + b * x + c
S = Intersect(parabel, q, 1.0)
tangent = Tangent(S, parabel)
d: b^(2.0) - 4.0 * a * c
R_2 = Intersect(parabel, f, 2.0)
R_1 = Intersect(parabel, f, 1.0)
symmetriakse: x = -(b) / (2.0 * a)
toppunkt = Intersect(parabel, symmetriakse, 1.0)