Behaviour being used: Adaptive mode
Minimum fraction: 0
Question summary: Welche Äquivalenzumformungen sind richtig: {[x squared plus 3 x equals x squared minus 21 left right double arrow 3 x equals negative 21]; [x squared plus 3 x equals x squared minus 21 left right double arrow 3 x cubed equals negative 21 x squared]; [x squared plus 3 x equals x squared minus 21 left right double arrow 2 x squared plus 3 x equals negative 21 x]} -> {falsch; richtig}
Right answer summary: [x squared plus 3 x equals x squared minus 21 left right double arrow 3 x equals negative 21] -> richtig; [x squared plus 3 x equals x squared minus 21 left right double arrow 3 x cubed equals negative 21 x squared] -> falsch; [x squared plus 3 x equals x squared minus 21 left right double arrow 2 x squared plus 3 x equals negative 21 x] -> falsch
Question state: todo