1@SMSM - Are you sure that you typed the qs. right ?
1. if W is the cube root of unity then (1-W+W2)5 +(1+W-W2) is equal to?????
2.if W is the cube root of unity then (1-W+W2)(1-W2+W6) is eqaul to???
-
UP 0 DOWN 0 0 5
5 Answers
1{ 1 - w + w 2 } 5 = { 1 + w + w 2 - 2 w } 5 = { - 2 w } 5 = - 32 w 2
{ 1 + w - w 2 } = { 1 + w + w 2 - 2 w 2 } = - 2 w 2
Adding them up gives ---------------- { - 34 w 2 }
Similarly , for the second one , the expression boils down to -
{ - 2 w } { 2 - w 2 } = - 4 w + 2
1its fine but the ans are not these. for frist one the ans is -128W nd 2nd one is 32. can't understand how ??
