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Va rog sa ma ajutati !

Trebuie sa descompun in factori aceste 2 exercitii

a) (3x+1)*la patrat* - (x+3)*la patrat*

b) (3x+5)*la patrat* - (x+1)*la patrat*

Multumesc anticipat !


Răspuns :

(3x+1+x+3) (3x+1-x-3)=(4x+4)(2x-2)=8(x+1)(x-1)


(3x+5+x+1)(3x+5-x-1)=(4x+6)(2x+4)=4(2x+3)(x+2)