a = 0.5 (slider from -5 to 5, step 0.5)
b = 2.5 (slider from -5 to 5, step 0.1)
c = 1.7 (slider from -5 to 5, step 0.1)
d = -1.4 (slider from -5 to 5, step 0.1)
f(x) = c * a^(x + b) + d
e: y = d