bonjour;
A= 7x² + x -x² +3 -3x
= 6x² -2x +3
B= 3x +15 +-x² -5x +2x +10
= -x² +25
C= 9x² -2x² -2x -8x -8
= 7x² -12x -8
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bonjour;
A= 7x² + x -x² +3 -3x
= 6x² -2x +3
B= 3x +15 +-x² -5x +2x +10
= -x² +25
C= 9x² -2x² -2x -8x -8
= 7x² -12x -8