Помогите пожалуйста!
Найдите правильный ответ.
Задание:
1) а^2+4ab+4b^2
2) (3x+a)^2
3) 100-40m+4m^2
4) (x-3)^2
5) x^2-9
6) (x-3)(x+3)
7) y^2-4
8) (x+7)(7-x)
9) a^2-b^2
10) (y+4)^2

Ответы:
1) 9x^2+6ax+a^2
2) x^2-6x+9
3) 49-x^2
4) y^2+8y+16
5) x^2-9
6) (a+2b)^2
7) (a-b)(a+b)
8) (10-2m)^2
9) (y-2)(y+2)
10) (x-3)(x+3)
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