1) a^2 - 4 = (a + 2)(a - 2)2) 9y^2 - x^2 = (3y + x)(3y - x)3) a^3 + 8b^3 = (a + 2b)(a^2 - 2ab + 4b^2)
1) a^2 - 4 = (a + 2)(a - 2)
2) 9y^2 - x^2 = (3y + x)(3y - x)
3) a^3 + 8b^3 = (a + 2b)(a^2 - 2ab + 4b^2)