x² + 8x + 15 = 0
                        ( -5 )

x² + 15x + 56 = 0
                        (    )

x² - 11x + 18 = 0
                        (    )

x² - 11x + 28 = 0
                        (    )

x² + 13x + 36 = 0
                        (    )

x² + 9x + 14 = 0
                        (    )

x² - 9 = 0
                        (    )

x² - 4 = 0
                        (    )

x² + 6x + 8 = 0
                        (    )

x² - 7x + 12 = 0
                        (    )

                      +[    ]

x² - 4 = 0
                        (    )

x² + 4x - 45 = 0
                        (    )

x² + 10x + 16 = 0
                        (    )

x² - 11x + 18 = 0
                        (    )

x² - 36 = 0
                        (    )

x² + 16x + 63 = 0
                        (    )

x² + 15x + 56 = 0
                        (    )

x² - 3x - 18 = 0
                        (    )

x² + 14x + 45 = 0
                        (    )

x² + 8x + 16 = 0
                        (    )

                      +[    ]

x² - 10x + 24 = 0
                        (    )

x² - 11x + 24 = 0
                        (    )

x² - 9 = 0
                        (    )

x² + x - 56 = 0
                        (    )

x² - 14x + 48 = 0
                        (    )

x² + 5x - 36 = 0
                        (    )

x² + 6x - 27 = 0
                        (    )

x² - x - 12 = 0
                        (    )

x² + 12x + 35 = 0
                        (    )

x² + 8x + 12 = 0
                        (    )

                      +[    ]
                 +++[[       ]]