8. If A = 7x² + 5xy - Gy?, B = - 4x2 + xy + 5y2 and C = 4y? - 3x2 - 6xy then she A + B + C = 0. 3 9. What must be added to 5x3 - 2x2 + 6x + 7 to make the sum x + 3x2 - x + 1?
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