please help supersu dissapears after attempting root

I have the sm-t230nu and i download the apk for supersu and I try to root and after i try to root it dissapears and i can't find it after that. Also it is important to know that when i try to download from the google play store it says google pay store stopped working. Also ive tried to download the apk and clear data and download from google play but that still doesnt work because when i attempt to root it still dissapears