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Sagot :

Bonjour,

Factoriser :

B=(4x+7)²-(5x+2)(4x+7)

B = (4x + 7) (4x + 7 - 5x - 2)

B = (4x + 7) (- x + 5)

Bonjour,

Factoriser

B=(4x+7)²-(5x+2)(4x+7)

B= (4x+7)(4x+7 - 5x - 2)   changement de signe

B= (4x+7)(-x+5)

B= - (4x+5)(x-5)

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