T336

a = 0.45 (slider from -5 to 5)
b = -0.4 (slider from -5 to 5)
c = -1.5 (slider from -5 to 5)
f(x) = (a * x^(2)) + (b * x) + c
k = 1 (slider from -5 to 5)
P: (k, f(k))
r = 2.7 (slider from 0 to 5, step 0.1)
P_1: (k + r, f(k + r))
P_2: (k - r, f(k - r))
g = Line(P_2, P_1)
h = Tangent(P, f)