When compared to f(x) = ln(x), which of the following will increase faster? Please justify your answer. A.) f(x) = 0.5 ln(x) B.) f(x) = 5 ln(x) C.) f(x) = ln(5x)
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The rate of increase of a function f(x) is the derivative of the function f'(x).
For f(x) = ln(x), `f'(x) = 1/x`
For f(x) = 0.5*ln(x), `f'(x) = 0.5/x`
For f(x) = 5*ln(x), `f'(x) = 5/x`
For f(x) = ln(5x) = ln 5 + ln(x), `f'(x) = 1/(x)`
From the derivatives of the functions it is seen that only `5/x` is greater than `1/x` .
The function f(x) = 5*ln(x) or option B increases at a rate faster than f(x) = ln(x).
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