Question

СРОЧНО НАДО ЗАВТРА СДАВАТЬ!!!!

Answer 1

1) = 25a^2 + 30a + 9
2) = x^2 - 12x + 36
3) = (a - 3)^2
4) = (x + 9)^2
5) = x^2 - 25
6) = 25y^2 - x^2
8) = (7a - 10) (7a + 10)
9) = y^2 + 4x^2 - y^2 = 4x^2