1. The problem statement, all variables and given/known data find the limit if it exist : lim (1/[x+Δχ] - 1/x) / Δχ x->0- 3. The attempt at a solution lim (1/[x+Δχ] - 1/x) / Δχ => lim -Δχ /(x+ Δx) / Δχ x->0- then what ? do i cancel the ΔX in the numerator with that in the denominator ? or whats the next step to solve this problem and did I do any mistake?