x² - 17x + 72 = 0
                        ( 8 )

x² - 3x - 40 = 0
                        (    )

x² - 4x + 4 = 0
                        (    )

x² + x - 12 = 0
                        (    )

x² - x - 42 = 0
                        (    )

x² + 4x - 21 = 0
                        (    )

x² + 13x + 40 = 0
                        (    )

x² - 13x + 40 = 0
                        (    )

x² - 4x - 32 = 0
                        (    )

x² + 3x - 54 = 0
                        (    )

                      +[    ]

x² - 16x + 63 = 0
                        (    )

x² + 10x + 25 = 0
                        (    )

x² - 64 = 0
                        (    )

x² - x - 30 = 0
                        (    )

x² + 9x + 14 = 0
                        (    )

x² + x - 12 = 0
                        (    )

x² + 6x - 27 = 0
                        (    )

x² + x - 30 = 0
                        (    )

x² - 5x - 36 = 0
                        (    )

x² + 13x + 36 = 0
                        (    )

                      +[    ]

x² + 9x + 14 = 0
                        (    )

x² + x - 20 = 0
                        (    )

x² + 6x - 27 = 0
                        (    )

x² + 4x - 12 = 0
                        (    )

x² + 6x - 27 = 0
                        (    )

x² + x - 30 = 0
                        (    )

x² - 3x - 10 = 0
                        (    )

x² - 10x + 24 = 0
                        (    )

x² - 13x + 40 = 0
                        (    )

x² + 8x + 16 = 0
                        (    )

                      +[    ]
                 +++[[       ]]