Answer:
7x - 6x² or -6x² + 7x
Explanation:
(7x-4x²) + (2x²-4x²)
7x - 4x² + 2x² - 4x² = 7x - 8x² + 2x² = 7x - 6x²
(7x³-4x²)+(2x³-4x²) = 7x³-4x²+2x³-4x² = 9x³ - 8x²
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