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You may want to work through the tutorial on Exponential Functions to explore the properties of the graphs of exponential functions before you start the tutorial on finding functions of exponential functions.
Click on the button above "click here to start" and maximize the window obtained.
Click on the button "new graph". The graph generated is that of an exponential function of the form
f(x) = a * e (x - b) + c
Find coefficients a, b and c. Coefficient a takes only two values +1 or -1. b and c takes integers values. c is related to the horizontal asymptote of the graph of f.
More references and links to topics related to exponential functions.
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