A. Factor the following completely. 1. x3 - 1 = 2. 64 + y12 = 3. x3y6 + 215 = 4. 27x9 + y3 = 5. 1 + y9212 = B. Extra Challenge. Factor the following completely. 1. 16x15 + 2y926 = 2. (x + z) 3 + ( x - z )3 = 3. [(x + y)3 - 8] = 4. (x - 1)3 + 64 = 5. ( x + y)3 + (x- y)3 =