f(x)=ax^4+bx^3+cx^2+dx+e

a = 0 (slider from -2 to 2, step 0.1)
b = 0.1 (slider from -5 to 5, step 0.1)
c = 0.5 (slider from -5 to 5, step 0.1)
d = -0.9 (slider from -5 to 5, step 0.1)
e = -0.7 (slider from -5 to 5, step 0.1)
f(x) = (a * x^(4)) + (b * x^(3)) + (c * x^(2)) + (d * x) + e