In this paper the perturbed neutral differential equation with positive and negative coefficients (d)/(dt)[x(t)-C(t)x(t-r)]+P(t)x(t-τ)-Q(t)x(t-σ)=f(t,x(t)), t
A neutral difference equation with positive and negative coefficientsΔ(xn-cnxn-k)+pnxn-l-qnxn-r=0, n=0,1,2,...,is considered and a sufficient condition for the