In David et al. (Adv Math 350:1109–1192, 2019) and Toro (Regularity of almost minimizers with free boundary. Calculus variations PDEs, 2020), the authors studied for functionals type first by Alt Caffarelli (J Reine Angew 325:105–144, 1981) (Trans Am Soc 282:431–461, 1984). this paper we study regularity to energy variable coefficients (as opposed Caffarelli, J 1981; al., Trans 1984; Adv 2019; ...