y = a*b^(x-c)+d 

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