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Descompuneti in factori (x+1)(x+3)²-4(x+1)

Răspuns :

(x+1) [ (x+3)²-4]=(x+1) [ (x+3)²-2²]
(x+1) (x+3-2) (x+3+2)=(x+1) (x+1)(x+5)=(x+1)²(x+5)