T518

k = 1.43 (slider from -5 to 5)
f(x) = ((8 * k^(3))) / (x^(2) + (4 * k^(2)))
a = 1 (slider from -5 to 5)
b = -3.9 (slider from -5 to 5)
c = 1.8 (slider from -5 to 5)
d = -0.1 (slider from -5 to 5)
eq1: (x * y) = (a * x^(3)) + (b * x^(2)) + (c * x) + d