Example--Verification (s2+1)(s+2)(s+3)=6s4+6s3+6s2+6s+5 665 6 6 5 S 5O Examine 1st column,of sign changes= 6Example--Verification 2 432 ( 1)( 2)( 3) 6 6 6 6 5 s s s ssss       4 3 2 0 665 660 s s s s s 0 5 Examine 1st column, # of sign changes=