If $f ( x ) = 8 x + \ln x$

Multiple Choice

If $f ( x ) = 8 x + \ln x$ , find $f ^ { - 1 } ( 8 )$

A) $f ^ { - 1 } ( 8 ) = 1$
B) $f ^ { - 1 } ( 8 ) = 0$
C) $f ^ { - 1 } ( 8 ) = 8$
D) $f ^ { - 1 } ( 8 ) = - 1$
E) $f ^ { - 1 } ( 8 ) = - 8$