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x²+5x+6 = 0
a = 1
b = 5
c = 6
b²-4ac = (5)² - 4 (1)(6)
= 25 -24
= 1
b = 5
c = 6
D = b² - 4ac
D = 5² - 4 × 1 × 6
D = 25 - 24
D = 1