Bonjour, Pouvez-vous vérifier mes calculs SVP?
Merci d'avance
1/ Réduire
A = -15x²+3x-9+6x²-14x+2
A = -9x²-11x-7


2/ Développer et réduire
B = (x-4)(5x-2) – (3-2x)(4x+5)
B= (5x²-2x-20x+8) – (12x+15-8x²-10x)
B = 5x²-2x-20x+8-12x-15+8x²+10x
B = 13x²-12x-7

3/ Développer et réduire
C = x(x-3)-[4(3x-2)+(6-3x)]
C = x²-3x – (12x-8+6-3x)
C = x²-3x-12x+8-6+3x
C = x²-12x+2
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