xmax = 8 (slider from -5 to 10)
g(x) = (-x^(3)) + (9.3 * x^(2)) + (21.6 * x) - 87
g'(x) = g'(x)
A, B = Extremum(g)
H: (xmax, g(xmax))
P = Point(g)
x0: x(P)
Q: (x0, g'(x0))
gL = -1 (slider from -5 to 5)
gR = 13 (slider from -5 to 20)
gU1 = -100 (slider from -200 to 5)
gU2 = -100 (slider from -200 to 5)
gO1: 250
gO2 = 100 (slider from -5 to 200)
gl1: x = x0
t = Tangent(P, g)
Text1: "x = " + x0 + ""
X: (x0, 500)