A logarithmic function is the inverse of an exponential function.

Given the graph of the exponential function, y = 2x, the inverse of the function is y = log2x.

 Graph of y=2^x and y=log_2⁡x

y = 2x
x–intercept none
y–intercept (0, 1)
Horizontal asymptote y = 0
Vertical asymptote none
Domain All real numbers
Range {y | y > 0}
Point on graph (1, 2)
y = log2 x
x–intercept (0, 1)
y–intercept none
Horizontal asymptote none
Vertical asymptote x = 0
Domain {x | x > 0}
Range All real numbers
Point on graph (2, 1)

In your notes, record four similarities you found in looking at the properties of the two functions.

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