According to the remainder theorem, the remainder obtained when a polynomial p(x) is divided by (x−a) is p(a).
Hence,
The remainder obtained when 5x+8 is divided by (x−1)=5× 1+8=13,
The remainder obtained when x2−2x+1 is divided by
(x−1)=12−2× 1+1=0,
The remainder obtained when x3+x2+1 is divided by
(x−1)=13+12+1=3 .