Resposta :

{2x²-9x+2}+{3x²+7x-1}
2x²-9x+2+ 3x²+7x-1
2x² + 3x² -9x +7x +2 -1
5x² -2x +1


{5x²+5x-8}+{-2x²+3x-2}
5x²+5x-8 -2x²+3x- 2
5x² - 2x² +5x +3x -8 -2
3x² +8x -10

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