Question 583159
 (y^2 – 6y + 8) (y + 8) =


Let's switch it around.  It does not matter because the answer does not change.


(y + 8)(y^2 – 6y + 8) =


y^3 -6y^2 + 8y + 8y^2 -48y + 64 = 


y^3 + 2y^2 -40y + 64

Done!