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Sagot :

A    x=4(x-1)(x-1)-9
      4(x²-x-x+1)-9 =4(x²-2x+1)-9  =(4x²-8x+4)-9  =4x²-8x-5
  
B    x= 4x²+2x-10x-5  =4x²-8x-5


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