Question 445983
{{{f(x) = ln ( 1/x + 4 ) }}}
There is no such thing as the log of a negative
number. That is like saying {{{ a^b = -c }}}
which is not possible.
Therefore, {{{  1/x + 4 >= 0 }}}
{{{ x <= -1/4 }}}
and
{{{ x >= 0 }}}