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Sagot :

c = (3x+5)²-(x+1)(3x+5)+3x+5
tu isoles (3x+5) ce qui te donne
(3x+5)(3x+5)-(x+1)+1
(3x+5)(3x+5-x-1+1)
(3x+5)(2x+5)
[tex]C = (3x+5)^2-(x+1)(3x+5)+3x+5\\= (3x+5)[(3x+5)-(x+1)+1]\\ =(3x+5)(3x+5-x-1+1)\\=(3x+5)(2x+5)[/tex]

En espérant t'avoir aidé.

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