a) 3x²-5x+2+2x-4+x² 4x² - 3x - 2
b) -4x²-3+2x-x²-4x²-7x+4 -9x² - 5x + 1
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a) 3x²-5x+2+2x-4+x²
4x² - 3x - 2
b) -4x²-3+2x-x²-4x²-7x+4
-9x² - 5x + 1