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Sagot :

il faut utiliser l'identité remarquable : (a-b)²=a²-2ab+b²

 

f(x)= x²-3x(x-4)²

     =x²-3x(x²-8x+16)

     =x²-3x³+24x²-48x

     =-3x³+25x²-48x

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