document.write( "Question 737828: f(x)=2^x+1, find f^-1(x) \n" ); document.write( "

Algebra.Com's Answer #450592 by josgarithmetic(39618) $\"\"$ $\"About$

You can put this solution on YOUR website!
The quick easy way is,
\n" ); document.write( " $\"y=2%5Ex%2B1\"$
\n" ); document.write( "Switch places x and y,
\n" ); document.write( " $\"x=2%5Ey%2B1\"$
\n" ); document.write( " $\"x-1=2%5Ey\"$
\n" ); document.write( "Change to logarithmic form,
\n" ); document.write( " $\"log%282%2C%28x-1%29%29=y\"$
\n" ); document.write( " $\"f%5E-1%28x%29=log%282%2C%28x-1%29%29\"$ \n" ); document.write( "

\n" );