Question 768064
{{{(g(x+h)-g(x))/h}}}
{{{((3(x+h)-(x+h)^2)-(3x-x^2))/h}}}
{{{(3x+3h-(x^2+2xh+h^2)-(3x2-x^2))/h}}}
{{{(3x+3h-x^2-2xh-h^2-3x+x^2)/h}}}
Watch for simplifications, cancellations within the numerator,
OKAY...
{{{(3h-2xh-h^2)/h}}}


EDIT: Corrected the mistake in my own work,


finish the simplification,
{{{highlight(3-2x-h)}}}