Step-by-step explanation:
→ 2x² – x – 15 = 0
→ 2x² – 1x – 15 = 0
→ a = 2, b = –1, c = (–15)
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D = b² – 4ac
D = (–1)² – 4(2)(–15)
D = 1 – 4 × 2 × (–15)
D = 1 – 8 × (–15)
D = 1 – (–120)
D = 1 + 120
