Question 635171
{{{f(x + h)=4(x+h)^2 - 5(x+h) + 7=4(x^2+2xh+h^2)-5x-5h+7=4x^2+8xh+4h^2-5x-5h+7}}}
{{{f(x + h) - f(x)=4x^2+8xh+4h^2-5x-5h+7-(4x^2 - 5x + 7)=4x^2+8xh+4h^2-5x-5h+7-4x^2 +5x -7=8xh+4h^2-5h}}}