## Exponential function

### An exponential function is a mathematical function of the form f(x) = ab^x, where a and b are constants, and b is the base of the exponential function

An exponential function is a mathematical function of the form f(x) = ab^x, where a and b are constants, and b is the base of the exponential function. The exponent x can be any real number or variable.

The key feature of an exponential function is that the variable is in the exponent. This leads to exponential growth or decay behavior, depending on the value of the base b.

If b > 1, the function exhibits exponential growth. As x increases, the value of f(x) increases at an increasing rate. The larger the value of b, the steeper the growth. For example, if b = 2, then f(x) doubles each time x increases by one.

If 0 < b < 1, the function exhibits exponential decay. As x increases, the value of f(x) decreases at a decreasing rate. The smaller the value of b, the steeper the decay. For example, if b = 1/2, then f(x) halves each time x increases by one. The constant a in the function f(x) = ab^x is the initial value or the value of the function when x = 0. It acts as a scaling factor, determining the starting point of the exponential growth or decay. Exponential functions have various applications in the real world, such as population growth, compound interest, radioactive decay, and bacterial growth. They can model phenomena that exhibit rapid growth or decay over time. To evaluate or graph an exponential function, you can choose different values for x and substitute them into the function. This will give you corresponding values of f(x) to plot on a graph. Pay attention to the behavior of the function as x increases or decreases. Additionally, it's worth mentioning that logarithmic functions are the inverse of exponential functions. They can be used to solve exponential equations or to convert exponential growth or decay into linear form for easier analysis. Overall, understanding exponential functions is essential in many areas of mathematics and science, as they represent a fundamental concept of exponential growth and decay.

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