B = (19.34548238135045, -7.371794241058688)
D = (-5.53755465233114, -7.388062664325304)
E = (-5.570344545913367, 8.875724552459234)
a = -0.1 (slider from -5 to 3, step 0.1)
b = 1.64 (slider from 0 to 8, step 0.01)
f(x) = (a * x^(2)) + (b * x)