Question 1006174
{{{f(x+h)=5(x+h)-4}}}


{{{f(x+h)-f(x)=5(x+h)-4-(5x-4)=5(x+h)-4-5x+4=5(x+h)-5x}}}
{{{whichEquals=5x+5h-5x=5h}}}


The difference quotient then is formed as  {{{highlight_green((5h)/h=5(h/h)=5*1=highlight_green(5))}}}.