Which best describes the asymptote of an exponential function of the form f(x)=b to the power of x
a) vertical asymptote at x=1
b) horizontal asymptote at y=0
c) vertical asymptote at x=0
d) horizontal asymptote at y=1

An exponential function is a function that contains a variable exponent. For example, f (x) = 2x and ... f(x) = 2x : Figure %: f (x) = 2x. The graph has a horizontal asymptote at y = 0 , because 2x > 0 for all x . It passes through the point (0, 1) . ... For example, f (x) = 3ƒ2x is stretched vertically by a factor of 3: Figure %: f (x) = 3ƒ2x.