1. D = 2² - 4 × 1 × (-8) = 4 + 32 = 36
2. D = 1² - 4 × 1 × (-6) = 1 + 24 = 25
3. D = 9² - 4 × 1 × 5 = 81 - 20 = 61
4. D = 6² - 4 × 2 × 3 = 36 - 24 = 12
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Answers & Comments
1. D = 2² - 4 × 1 × (-8) = 4 + 32 = 36
2. D = 1² - 4 × 1 × (-6) = 1 + 24 = 25
3. D = 9² - 4 × 1 × 5 = 81 - 20 = 61
4. D = 6² - 4 × 2 × 3 = 36 - 24 = 12