Предмет: Алгебра, автор: Любабобылева

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а)81а в четвертой -1;
б)у²-х²-6х-9
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Автор ответа: tamarabernukho
0
81a^4-1=(9a²)²-1²=(9a²+1)(9a²-1)=(9a²+1)(3a+1)(3a-1)

у²-х²-6х-9=y²-(x+3)²=(y+x+3)(y-x-3)
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