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Descompuneti in factori 25(x-6) la 2 - 49

Răspuns :

Exista formula diferenta patratelor:
a²-b²=(a+b)(a-b)

25(x-6)²-49=5²(x-6)²-7²=[5(x-6)]²-7²=(5x-30)²-7²=(5x-30+7)(5x-30-7)=(5x-23)(5x-37)