a = 0 (slider from -5 to 5, step 0.1)
b = 1 (slider from -5 to 5, step 0.1)
c = 1 (slider from -5 to 5, step 0.1)
d = 1 (slider from -5 to 5, step 0.1)
f(x) = a * x^(3) + b * x^(2) + c * x + d