Step-by-step explanation:
→ 9x² – 6x = -9
→ 9x² – 6x + 9 = 0
→ a = 9, b = 6, c = 9
So:
D = b² - 4ac
D = 6² - 4(9)(9)
D = 36 – 4 × 9 × 9
D = 36 – 36 × 9
D = 36 – 324
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