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If (a + bi)(a - bi) = 13 and a - b = 1 then a² + b² equals?
  1. 13
  2. 14
  3. 15
  4. None of these
Explanation

(a + bi)(a - bi) = a² - (bi)² = a² - b²i² = a² + b²  

Given: a² + b² = 13  


Last verified on 07-05-2026

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