Multiple choice The H.C.F of (x3 + x2 + x + 1) and (x4 - 1) is (x2 - 1) (x2 + 1) (x + 1) (x2 + 1) (x + 1 ) (x2 - 1) None of these Reveal answer Fill a bubble to check yourself B Correct answer Explanation x3 + x2 + x + 1 = (x2 + 1) (x + 1) and x4 - 1 = (x - 1) (x + 1) (x2 + 1) H.C.F. = (x + 1) (x2 + 1)