9a^2 - m^2 = (3a + m)(3a - m)
1 + 6h + 12h^2 + 8h^3 = (1 + 2h)(1 + 4h + 4h^2) = (1 + 2h)(1 + 2h)^2 = (1 + 2h)^3
x^2 + 4xy + 4y^2 = (x + 2y)^2
27s^3 - 8d^3 = (3s - 2d)(9s^2 + 6sd + 4d^2)
9a^2 - m^2 = (3a + m)(3a - m)
1 + 6h + 12h^2 + 8h^3 = (1 + 2h)(1 + 4h + 4h^2) = (1 + 2h)(1 + 2h)^2 = (1 + 2h)^3
x^2 + 4xy + 4y^2 = (x + 2y)^2
27s^3 - 8d^3 = (3s - 2d)(9s^2 + 6sd + 4d^2)