Question 210391
{{{f(x)=3-5x^2}}}
===================
{{{DQ=(f(x+h)-f(x))/h}}}
{{{DQ=(3-5(x+h)^2-(3-5x^2))/h}}}
{{{DQ=(3-5(x^2+2hx+h^2)-3+5x^2)/h}}}
{{{DQ=(3-5x^2-10hx-5h^2-3+5x^2)/h}}}
{{{DQ=(-10hx-5h^2)/h}}}
{{{highlight(DQ=-10x-5h)}}}
==============
Good Luck,
tutor_paul@yahoo.com