Sendo f(x)=x², calcule: f(x+h)-f(x)
[tex]f(x+h)-f(x)=\\ (x+h)^2-x^2=\\ x^2+2xh+h^2-x^2=\\ h^2+2hx[/tex]
[tex]x^2+2xh+h^2-x^2=\\ 2hx+h^2=\\\\ h(2x+h)[/tex]