1) 25x^2 - 9 = (5x + 3)(5x - 3)2) 4a^2 - 9 = (2a + 3)(2a - 3)3) 64y^2 - 36x^2 = (8y + 6x)(8y - 6x)4) 81a^2 - 16b^2 = (9a + 4b)(9a - 4b)
1) 25x^2 - 9 = (5x + 3)(5x - 3)
2) 4a^2 - 9 = (2a + 3)(2a - 3)
3) 64y^2 - 36x^2 = (8y + 6x)(8y - 6x)
4) 81a^2 - 16b^2 = (9a + 4b)(9a - 4b)