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Sagot :

Bonjour,

Factoriser:

f(x)= (2x+1)(x-5)-(2x+1)(-4x-(20)

f(x)= (2x+1)(x-5)+4(2x+1)(x+5)

f(x)= (2x+1)(x-5+4(x+5))

f(x)= (2x+1)(x-5+4x+20)

f(x)= (2x+1)(5x+15)

f(x)= 5(2x+1)(x+3)

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