# Thread: inverse and the domain...

1. ## inverse and the domain...

i cant seem to get the inverse of this function. (oh and sorry if this is in the wrong place i didnt know where to put it)

f(x)=1-2^x x E R

ive got so far but i cant seem to finish it .... and how do you find the domain of this invserse (is it x E R)

thanks

2. hi.
$f(x)=1-2^{x}\Leftrightarrow y=1-2^{x}\Leftrightarrow x=1-2^{y}$...then solve for y,and change it to $f^{-1}(x)$.
the domain of the inverse is equal to the range of f.