document.write( "Question 371369: Factor completely: y^4-1 I am not sure how to factor this. Thank you. \n" ); document.write( "
Algebra.Com's Answer #264551 by Fombitz(32388)\"\" \"About 
You can put this solution on YOUR website!
It's a difference of two squares.
\n" ); document.write( "\"y%5E4-1=%28y%5E2-1%29%28y%5E2%2B1%29\"
\n" ); document.write( "The first factor is also a difference of two squares.
\n" ); document.write( "\"highlight%28y%5E4-1=%28y-1%29%28y%2B1%29%28y%5E2%2B1%29%29\"
\n" ); document.write( "
\n" ); document.write( "
\n" );