Let f (x) = 3 + x + ln(x − 8 ), x > 8. (a) Find f^-1(12) (b) Find f^-( f (15))
Last edited by amramr; Sep 8th 2017 at 07:09 AM.
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Originally Posted by amramr Let f (x) = 3 + x + ln(x − 8 ), x > 8. (a) Find f^-1(12) (b) Find f^-( f (15)) (a) by observation, $f(9) = 12 \implies f^{-1}(12) = 9$ (b) note ... the function $f$ maps $x \to f(x) \implies$ the inverse function $f^{-1}$ maps $f(x) \to x$ so, $f^{-1}[f(15)] = \, ?$