Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If 
and 
, then 
Text Solution
Verified by ExpertsThe correct answer is:
18
(18)
If 
, find 
Step 1: Use complex numbers
Let 
.
Step 2: Use the identity for weighted cubes
Better: For weighted sums, the known result:
If 
, then
Here 
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