Z00040. Factor the following (for 39, 40 find the value of a to make it factorable).

(3) 2y⁶z – y⁴z¹⁰ + 3y²z²

(8) w²(1+w²) (8w – 1)¹⁰ + 9w (1+w²)⁴ (8w -1)⁷

(13) 6t³ + 3t⁴ – 2t⁵ – t⁶

(15) t² + 11t + 24