Asymptotic behavior of solutions of forced nonlinear neutral difference equations

In this paper, we consider the asymptotic behavior of solutions of the forced nonlinear neutral difference equation $$\Delta \left {x(n) - \sum\limits_{i - 1}^m {p_i (n)x(n - k_i )} } \right] + \sum\limits_{j = 1}^s {q_j (n)f(x(n - l_j )) = r(n)} $$ with sign changing coefficients. Some sufficient conditions for every solution of (*) to tend to zero are established. The results extend and improve some known theorems in literature.