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Sagot :

bonsoir

factorisation, passer de (x-1)²-9 à (x-4)(x+2)​

= (x - 1)^2 - 3^2

= (x - 1 - 3)(x - 1 + 3)

= (x - 4)(x + 2)

C’est du type : a^2 - b^2 = (a - b)(a + b)

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