(-7x²+8x-1) - (-2x²+12x-4)
= -7x² + 8x - 1 +2x² - 12x + 4
= -7x² + 2x² + 8x - 12x - 1 + 4
= -5x² - 4x + 3 atau
= 5x² + 4x - 3
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(-7x²+8x-1) - (-2x²+12x-4)
= -7x² + 8x - 1 +2x² - 12x + 4
= -7x² + 2x² + 8x - 12x - 1 + 4
= -5x² - 4x + 3 atau
= 5x² + 4x - 3
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