Bonsoir,
Développer A:
A= 2x²-7x-8x+28+4x²-49-2x+7
A= 6x²-17x-14
Factoriser A:
A= (2x-7)(x-4)+4x²-49-(2x-7)
A= (2x-7)(x-4)+(2x-7)(2x+7)-(2x-7)
A= (2x-7)(x-4+2x+7-1)
A= (2x-7)(3x+2)
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Bonsoir,
Développer A:
A= 2x²-7x-8x+28+4x²-49-2x+7
A= 6x²-17x-14
Factoriser A:
A= (2x-7)(x-4)+4x²-49-(2x-7)
A= (2x-7)(x-4)+(2x-7)(2x+7)-(2x-7)
A= (2x-7)(x-4+2x+7-1)
A= (2x-7)(3x+2)