\( f(4.69) \approx (4.69)^3 - 8(4.69)^2 + 9(4.69) - 18 \approx 102.7 - 175.6 + 42.2 - 18 \approx -49.7 < 0 \),

Wed, 06 May 2026 13:22:52 +0000

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