Question 132762
(1)  {{{f(x)=3^x - 2}}}
(2)  {{{f(x)=log(2x)}}}
{{{ graph( 600, 600, -4, 4, -4, 4, 3^x - 2,log(10,2x)) }}}
The graph shows that {{2x}}} for {{{log(2x)}}} can not
be negative. That's because there's no way {{{10^y}}}
(y = f(x))can possibly be negative.