<PRE><B>Question 228359</B>
What are you supposed to do with this?  Factor it???  If so, this is a difference of two squares:
y^4-81
(y^2-9)(y^2+9)


The (y^2-9) factor factors again into (y-3)(y+3).  Notice that the (Y^2+9) does NOT factor.



(y^2-9)(y^2+9)
(y-3)(y+3)(y^2+9)


Dr. Robert J. Rapalje
Seminole State College of Florida
Altamonte Springs Campus</PRE>