Teaching DSSSB PGT Mock Test 2025 Engineering Mathematics Complex Variables

Let f(z) = (z2 - Z - 1)7. If α2 + α +1 = 0 and Imz(α) > 0 then find f(α).

1
128 α 
2
-128 α 
3
128 α2
4
-128 α2
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