x² - 11x + 18 = 0
                        ( 2 )

x² - 16x + 64 = 0
                        (    )

x² - 8x + 15 = 0
                        (    )

x² + 7x + 12 = 0
                        (    )

x² + 14x + 48 = 0
                        (    )

x² - x - 30 = 0
                        (    )

x² + 15x + 54 = 0
                        (    )

x² + 12x + 35 = 0
                        (    )

x² - 16x + 63 = 0
                        (    )

x² - x - 12 = 0
                        (    )

                      +[    ]

x² - 81 = 0
                        (    )

x² - 12x + 27 = 0
                        (    )

x² + 10x + 16 = 0
                        (    )

x² - x - 72 = 0
                        (    )

x² + 16x + 64 = 0
                        (    )

x² - x - 56 = 0
                        (    )

x² - 4x - 12 = 0
                        (    )

x² + 2x - 15 = 0
                        (    )

x² - 10x + 16 = 0
                        (    )

x² + 2x - 24 = 0
                        (    )

                      +[    ]

x² + 15x + 54 = 0
                        (    )

x² + 4x - 12 = 0
                        (    )

x² + 12x + 27 = 0
                        (    )

x² - 6x - 16 = 0
                        (    )

x² + 10x + 24 = 0
                        (    )

x² - 5x - 14 = 0
                        (    )

x² - 4x - 12 = 0
                        (    )

x² - 6x - 16 = 0
                        (    )

x² + 5x + 6 = 0
                        (    )

x² - 64 = 0
                        (    )

                      +[    ]
                 +++[[       ]]