1) 4x^2y^2 - 9a^4 = (2xy + 3a^2)(2xy - 3a^2)2) 25a^2 - (a+3)^2 = (5a - (a+3))(5a + (a+3)) = (5a - a - 3)(5a + a + 3) = (4a - 3)(6a + 3)3) 27m^3 + n^3 = (3m + n)(9m^2 - 3mn + n^2)
1) 4x^2y^2 - 9a^4 = (2xy + 3a^2)(2xy - 3a^2)
2) 25a^2 - (a+3)^2 = (5a - (a+3))(5a + (a+3)) = (5a - a - 3)(5a + a + 3) = (4a - 3)(6a + 3)
3) 27m^3 + n^3 = (3m + n)(9m^2 - 3mn + n^2)