Question

calcule o limite :
lim (x+h)^2-x^2/h
h→0

Answer 1

(x^2+2xh+h^2-x^2)/h=(2xh+h^2)h=h (2x+h)/h=
2x+h e h tendendo a "0".
lim 2x+h=2x
h--> 0