Réponse:
A=4x²-4x+1+35x+20
= 4x²+31x+21
B=21x²-35x +9x²+12x+4
= 30x²-23x+4
C= 36-12x+x²-(x²-49)
=36-12x+x²-x²+49
= -12x+85
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Réponse:
A=4x²-4x+1+35x+20
= 4x²+31x+21
B=21x²-35x +9x²+12x+4
= 30x²-23x+4
C= 36-12x+x²-(x²-49)
=36-12x+x²-x²+49
= -12x+85