Some hyperstability results of a p-radical functional equation related to Drygas mappings in non-Archimedean Banach spaces

The aim of this paper is to introduce and solve the following pradical functional equation related Drygas mappings f(?(p&x^p+ y^p ))+f(?(p&x^p+ ))=2f(x)+f(y)+f(-y),x,y ?R, where f a mapping from R into vector space X p ? 3 an odd natural number. Using analogue version Brzd?k’s fixed point theorem [14], we establish some hyperstability results for considered in non-Archimedean Banach spaces. Also, give inhomogeneous p-radical ))=2f(x)+f(y)+f(-y)+G(x,y)