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Sagot :

XXX102

Bonsoir,

 

On développe : [tex]f(x) = (2x-1)(3+x) = 2x^2+5x-3[/tex]

ALEK75

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

 = 6x+2x²-3-x

f(x)=2x²-5x-3

 

Donc  2x²+5x-3 = (2x-1) (3+x)

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