Coeficiente c = 0, Fórmula resolutiva (Bhaskara), b2 - 4 . a . c - =, Coeficiente a = 1 - x2 - 3x + 8 = 0, Coeficiente b = 0 - 7x2 - 8 = 0, △ = 1 - △ = 52 - 4. 1 . 6, △ = 49 - △ = 52 - 4. 1 . (-6), △ = 9 - △ = 32 - 4. 1 . 0, 5, 15, 8, 144 - 122, 81 - 92, a + b + c = -1 - 5x2 - 10 x + 4 = 0 (a + b + c = ?), a + b + c = 12 - 3x2 + 7 x + 2 = 0 (a + b + c = ?),

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