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Descompuneti in factori: 25a²-(a+3)²

Răspuns :

25a²-(a+3)² = (5a-a-3)*(5a+a+3)= (4a-3)*(6a+3)
Formula a²-b²=(a-b)(a+b)
25a²-(a+3)²=(5a-a-3)(5a+a+3)
                  =(4a-3)(6a+3)