D = b² - 4ac
D = (-3)² - (4 × 1 × -18)
D = 9 - (-72)
D = 9 + 72
D = 81
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D = b² - 4ac
D = (-3)² - (4 × 1 × -18)
D = 9 - (-72)
D = 9 + 72
D = 81