Question

Factorise this : (x+7) (x+4) (x-1) (x+2)​

Answer 1

Answer:

x8+x7+x6+x5+x4+x3+x2+x+ 1. =(x2+x+1)(x2−2cos(2π9)x+1)(x2−2cos(4π9 )x+1)(x2−2cos(8π9)x+1). Explanation:.

x8+x7+x6+x5+x4+x3+x2+x+1 =(x2+x+1)