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Sagot :

E=(3x+1)²-4

 

on développe

 

(3x)²+2*3x*1+1²-4

9x²+6x+1-4

9x²+6x-3

 

on factorise

 

3(x+1)(3x-1)

(3x+1)(3x+1)-4

3x*3x+3x*1+1*3x+1*1-4

9x²+3x+3x+1-4

9x²+6x-3

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