<PRE><B>Question 155374</B>
4y^3 - 64u^2y
4y(y^2-16u^2)
4y(y-4u)(y+4u)
--------------------
y^2 + 8y + 7
(y+7)(y+1)
-------------------- 
15z^2 - 26z - 21
(5z+3)(3z-7)
-------------------
21uv^3 - 46uv^2 + 24uv 
uv(21v^2-46v+24)
uv(7v-6)(3v-4)</PRE>