%0 Journal Article %T Symmetry Lie algebra and exact solutions of some fourth-order difference equations %A Mnguni, N. %A Nyirenda, D. %A Folly-Gbetoula, M. %J Journal of Nonlinear Sciences and Applications %D 2018 %V 11 %N 11 %@ ISSN 2008-1901 %F Mnguni2018 %X In this paper, all the Lie point symmetries of difference equations of the form \[ u_{n+4}=\frac{u_n}{A_n +B_nu_nu_{n+2}}, \] where, \((A_n)_{n \geq 0}\) and \((B_n)_{n \geq 0}\) are sequences of real numbers, are obtained. We perform reduction of order using the invariant of the group of transformations. Furthermore, we obtain their solutions. In particular, our work generalizes some results in the literature. %9 journal article %R 10.22436/jnsa.011.11.06 %U http://dx.doi.org/10.22436/jnsa.011.11.06 %P 1262--1270