Question 1126136
{{{ x^2 + 13x + 36 = ( x + 4 )*( x + 9 ) }}} ( by looking at it )
{{{ x + 9 }}} is the longer side, so the difference is
{{{ x + 9 - ( x + 4 ) = x + 9 - x - 4 }}}
{{{ x + 9 - x - 4 = 5 }}}
the length is 5 ft longer than the width