f(x)=ab^x

asymptote: y=0

a = 1.4 (slider from -20 to 20, step 0.1)
b = 1.2 (slider from -20 to 20, step 0.1)
f(x) = (a * b^(x))
texte1 = LaTeX(f, true, true)
g: y = 0
A: (0, f(0))
B: (-2, f(-2))
C: (-6, f(-6))
D: (-8, f(-8))
E: (2, f(2))
F: (4, f(4))