a = 0.3 (slider from 0 to 1, step 0.02)
b = 3 (slider from 1 to 5, step 0.05)
f(x) = b^(x)
g(x) = a^(x)
texto1: "f_1(x)=a^x=" + (LaTeX[a]) + "\,^x"
texto2: "f_2(x)=b^x=" + (LaTeX[b]) + "\,^x"