Mathématiques

Question

 Factoriser A = ( 3x + 2)² -  (7x - 1)² (3x + 2)

1 Réponse

  • A=(3x+2)²-(7x-1)²(3x+2)
    =
    (3x+2)(3x+2)-(7x-1)²(3x+2)
    =(3x+2)[3x+2-(7x-1)²]
    =(3x+2)[3x-2-(49x²-14x+1)]
    =(3x+2)(3x-2-49x²+14x-1)
    =(3x+2)(-49x²+17x-3)

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