Rozłoż wyrażenia na czynniki (za pomocą wzoru skruconego mnozenia): (x+2)*x^2-(x+2)*9=
...= (x+2)(x^2-9)=(x+2)(x-3)(x+3)
a^2 -b^2 =(a-b)(a+b)
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...= (x+2)(x^2-9)=(x+2)(x-3)(x+3)
a^2 -b^2 =(a-b)(a+b)