Réponse:
A) 2x² + 12x + 9 + 2x² +3x -4x -6
= 4x² + 11x +3
B) 2t -7 - 10t² + 7 - 2t +7
= 10t² + 7
C) 2x² - 6x +x -3 +2x +1
= 2x² -3x -2
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Réponse:
A) 2x² + 12x + 9 + 2x² +3x -4x -6
= 4x² + 11x +3
B) 2t -7 - 10t² + 7 - 2t +7
= 10t² + 7
C) 2x² - 6x +x -3 +2x +1
= 2x² -3x -2