Répondre :
C = 4x² +12x +9 -9x² +24x -16
= -5x² +36x -7
D = x² -10x +25 +1 -8x +16x²
= 17x² -18x +26
E = 16x² -24x +9 -6x² +4x -3x +2
= 10x² -23x +11
= -5x² +36x -7
D = x² -10x +25 +1 -8x +16x²
= 17x² -18x +26
E = 16x² -24x +9 -6x² +4x -3x +2
= 10x² -23x +11