Identify the multiplicative inverse of -i.
A-i
B-1
Ci
D1/i (which equals i, so same as option A)
Answer & Solution
Correct answer: C. i
For z = -i: z̄ = i; |z|² = 0² + (-1)² = 1. So z⁻¹ = z̄ / |z|² = i/1 = i. Verify: (-i)(i) = -i² = -(-1) = 1 ✓.
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