Solution to algebraic equations of degree 4 and the fundamental theorem of algebra by Carl Friedrich Gauss - Südland, Norbert; Volkmann, Jörg; Kumar, Dinesh (Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica; Tom 21 (2022); 57-70 ; Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica; Vol. 21 (2022); 57-70 ; 2300-133X ; 2081-545X, 2022)