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Sagot :

Bonjour,
1) A = (6x+3)(5x-2)
= 30x^2-12x+15x-6
A = 30x^2+3x-6

2) B = (-5x+4)(3x-2)-(6x+7-3x^2)
= -15x^2+10x+12x-8-6x-7+3x^2
= -12x^2+16x-15

Ps : “x^2” signifie x au carré

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