Question 903436
Do you mean {{{f(x+h)}}}?
{{{f(x)=x-2x^2}}}
{{{f(x+h)=(x+h)-2(x+h)^2}}}
{{{f(x+h)=x+h-2(x^2+2xh+h^2)}}}
{{{f(x+h)=x+h-2x^2-4xh-2h^2}}}
{{{f(x+h)=-2x^2+x(1-4h)-2h^2}}}