MATH 111 Lecture Notes - Lecture 3: Exponential Function

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1476- lecture 3- euler"s number, inverse functions and logarithms. Y=ex has a slope of 1 when it crosses the y-axis. F(x) = ex is called the natural exponential function. A function must pass the horizontal line test for its inverse to be a function. The inverse function"s domain is the range of the original function, and its range is the domain of the original function. The composition of a function and its inverse cancels out to equal x. How to find the inverse of a function. Substitute the term f(x) with a variable (such as y) Solve the equation for x in terms of y. Interchange x and y (this can also be done after the first step, which would negate the need for the previous step) The resulting equation is y= f-1 (x) The graph of f-1 (x) is obtained by reflecting the graph of f (x) about the line y=x.

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