Question 1176846
{{{f(x) = 4x + 5}}} 
{{{g(x) = 9x -4}}}


{{{(f - g)(x) =4x + 5-(9x -4)}}}
{{{(f -g)(x) =4x + 5-9x + 4}}}
{{{(f - g)(x) =-5x + 9}}}


domain: {{{R}}} (all real numbers)

 interval notation: ({{{-infinity}}},{{{infinity}}})