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Descompuneti in factori folosind formula factorului comun:
a) (n+3q)²-4(q-n)²=
b)a²+6a+9=


Răspuns :

[tex]a)(n+3q)^2-4(q-n)^2=(n+3q-2q+2n)(n+3q+2q-2n)=\\ =(3n+q)(5q-n)\\ b)a^2+6a+9=(a+3)^2[/tex]