1) a^2y^2 - x^6 = (ay - x^3)(ay + x^3)
2) 3b + bc + 3ac + 9a = 3(b + c) + 3a(b + c) = (b + c)(3 + 3a)
3) 27a^3 - 64b^3 = (3a - 4b)(9a^2 + 12ab + 16b^2)
1) a^2y^2 - x^6 = (ay - x^3)(ay + x^3)
2) 3b + bc + 3ac + 9a = 3(b + c) + 3a(b + c) = (b + c)(3 + 3a)
3) 27a^3 - 64b^3 = (3a - 4b)(9a^2 + 12ab + 16b^2)