Question 1170510
This becomes 8(x^2+2xh+h^2)+2(x+h)-2 - [8x^2-+2x-2] all divided by h. Looking at the numerator,
this is 8x^2+16xh+8h^2+2x+2h-2-8x^2-2x+2 divided by h
that leaves 16xh+2h all divided by h
=16x+2