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B. 8x² + 3
= (7+3)x² + (2-8)x + (5-10)
= 10x² - 6x - 5
B. (2x² - 4x + 6) - (3 - 4x + 6x²)
=(2-6)x² + (-4+4)x + (6-3)
=-4x² + 3