Teaching DSSSB PGT Mock Test 2025 Engineering Mathematics Complex Variables

मान लीजिए f(z) = (z2 - Z - 1)7 है। यदि α2 + α +1 = 0 और Imz(α) > 0 है, तो f(α) का मान क्या है?

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