$c=%v$

$a=%v$

$d=%v$

c = 1 (slider from -5 to 5, step 0.1)
a = 2 (slider from 0 to 5, step 0.1)
d = 0 (slider from -5 to 5, step 0.1)
f(x) = (c * a^(x)) + d
Text: "f(x)=" + (LaTeX[LaTeX[f]]) + ""