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Sagot :

Factoriser : f(x)  = x(x+2)-(2x-1)(x+2)
                         =(x+2)(x-2x+1)
                         =(x+2)(1-x)
f(x) = x(x + 2) - (2x - 1)(x + 2)
f(x) = (x + 2)(x - 2x + 1)
f(x) = (x + 2)(- x + 1).

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