Question 436769
{{{(f(x+h)-f(x))/h = ((x+h)^3 + 3(x+h)^2 - 4(x+h) + 5 - x^3 - 3x^2 + 4x - 5)/h}}}
={{{(x^3 + 3x^2h + 3xh^2 + h^3 + 3x^2 + 6hx + 3h^2 - 4x - 4h + 5 - x^3 - 3x^2 + 4x - 5)/h}}}
={{{(3x^2h + 3xh^2 + h^3 + 6hx + 3h^2 - 4h)/h}}}
={{{3x^2 + 3hx  + h^2 + 6x + 3h - 4}}}