alleryStart learning →For z = a + ib, the product of z and its conjugate equals which of these?
Aa² − b²
Ba² + ab
Ca² + b²
D2a + 2b
Answer & Solution
Correct answer: C. a² + b²
(a + ib)(a − ib) = a² − i²b² = a² + b², which is |z|².
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