Предмет: Алгебра, автор: darinakhmetova2008

Помогите пожалуйста ​

Приложения:

Ответы

Автор ответа: Avantgardе
2

a^2-b^2=(a-b)(a+b)\\\\4a^2-81=(2a)^2-9^2=(2a+9)(2a-9)

Ответ:  2

Автор ответа: Demanaize
1

4a {}^{2} - 81 = (2a + 9) \times (2a - 9)

Ответ:2)

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