document.write( "Question 371369: Factor completely: y^4-1 I am not sure how to factor this. Thank you. \n" ); document.write( "
\n" ); document.write( "Hi,\n" ); document.write( "Factoring completely\n" ); document.write( "y^4-1\n" ); document.write( "(y^2 -1)(y^2 +1)\n" ); document.write( "(y-1)(y+1)(y^2+ 1)