Réponse :
Bonjour,
A=(2x+3) [7(5x-2)+4(3x-1)]
=(2x+3) [35x -14 +12x-4]
=(2x+3) (47x -18)
B= (2x-7) [5(4x+3)-3(2x-7)]
=(2x-7) [20x +15 -6x + 21]
=(2x-7) ( 12x +36)
C= [(3x-4)+(7x+5)] [(3x-4)-(7x+5)]
=[3x-4+7x+5] [3x-4-7x-5]
=(10x+1) (-4x -9)
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Réponse :
Bonjour,
A=(2x+3) [7(5x-2)+4(3x-1)]
=(2x+3) [35x -14 +12x-4]
=(2x+3) (47x -18)
B= (2x-7) [5(4x+3)-3(2x-7)]
=(2x-7) [20x +15 -6x + 21]
=(2x-7) ( 12x +36)
C= [(3x-4)+(7x+5)] [(3x-4)-(7x+5)]
=[3x-4+7x+5] [3x-4-7x-5]
=(10x+1) (-4x -9)