If f(x) = ln 4x, what is the value of f^-1(6). (The f raises to the -1 is the inverse function of f(x).
The answer is 100.86.
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So, let y = ln(4x). How, in general, do you invert functions?
The natural log (ln) has a base e, so another way of rewriting f(x) = ln 4x or y = ln 4x:
y = 6. Substituting it into this equation and solving for x will yield approximately 100.86.
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