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Sagot :

Bonsoir.

Développer puis réduire :

C = (x-7)(x+9)

C = x²+9x-7x-63

C = x²+2x-63

D = (x-3)(4-x)

D = 4x-x²-12+3x

D = -x²+7x-12

E= (3x+4)(5x-7)

E = 15x²-21x+20x-28

E = 15x²-x-28

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

F = -8x+2x²+32-8x

F = 2x²+32

Bonne soirée.

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