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Sagot :

(5x-3)²-81 = (5x-3)²-9²
= (5x-3+9)(5x-3-9)
= (5x+6)(5x-12)
Voila ;)

Factoriser 

Tu entoure (5x-3)

et tu ecrit :

(5x-3) (5x-3-81)

(5x-3) (-79x)

Voila 

 

 

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