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Exponential Functions

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CORRECTION: ON MINUTE 19:22 THE GRAPH OF F(X)=2(3^X) GOES THRU 2, NOT 1. THE NEXT GRAPHS HAVE TO BE FIXED, ACCORDINGLY. Definition of exponential function. Examples: f(x)=x^2 is NOT exponential. f(x)=2^x IS exponential. Graphs of exponential fucntions. Damain and Range. Transformations of exponential functions: horizontal and vertical shifts; compressions and stretches; reflections.