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Descompune-ti in factori
A) ( 3x + 1 )^2 - ( x + 3 ) = ?


Răspuns :

(x+3)^2-(x+3)=
x^2+6x+9-x-3=
x^2+5x+6.
[tex](x+3)^2-(x+3)=[/tex]
[tex]x^2+6x+9-x-3=[/tex]
[tex]x^2+5x+6. [/tex]