# inverse and the domain...

• October 26th 2009, 02:45 AM
pop_91
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 :)
• October 26th 2009, 03:18 AM
Raoh
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.
http://www1.wolframalpha.com/Calcula...image/gif&s=36