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Sagot :

A1111

F= (-3x + 4)(3x - 8) - (-3x + 4)(7x + 2)

F= -9x²+2x+12x-32 - (-21x²-6x+28x+8)

F= -9x²+2x+12x-32 +21x²+6x-28x-8

F=-9x²+21x²+2x+12x+6x-28x-32-8

F=12x²-8x-40

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