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In this lesson, we will explore the definition of an exponential function: f(x) = a^x, a greater than 0, a is not equal to 1. We will discuss the restrictions on the base, as well as the range for the function. Additionally, we will learn how to sketch the graph of an exponential function. We will look at how to reflect the graph across the x-axis or y-axis, along with how to perform a horizontal or vertical shift.