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(1) x² + 9x - 10 = 0
D = b² - 4ac
D = 9² - 4(1)(- 10)
D = 81 + 40
D = 121 (2 penyelesaian)
(2) x² - 6x + 9
D = (- 6)² - 4(1)(9)
D = 36 - 36
D = 0 (1 penyelesaian)
(3) x² - 8x + 12 = 0
D = (- 8)² - 4(1)(12)
D = 64 - 48
D = 16 (2 penyelesaian)
(4) x² + 4x + 4 = 0
D = 4² - 4(1)(4)
D = 16 - 16
D = 0 (1 penyelesaian)
(2 dan 4)