Definition: Generally, a function of the form y=a^x(a>0 and a≠1) (x∈R) is called an exponential function. That is to say, a function with exponent as independent variable, power as dependent variable and base as constant is an exponential function. It is a kind of elementary function. It can be extended to be defined as an analytic function on C.

General formula y=a^x(a>0 and a≠1) (x∈R)