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Z.B    y = - 2 ( x+2)² +4                                               Scheitelform
                  3 
                      (a² +2ab+b²)
                -2(x²+2*x*2+2²)+4
                 3
                   -2(x²+4x+4) + 4                                  Ausklammern (*)
                    3
                           -2x²-8x-8+4
                            3     3   3

                         -2x²-22x+11                                            Allgemeine Form
                          3       3      3