Question 49Asked in BPSC TRE 1.0 (2023) Mathematics Class 11-12

If z₁ = 2 − i and z₂ = 1 + i, then the value of |(z₁ + z₂ + 1)/(z₁ − z₂ + i)|² isयदि z₁ = 2 − i और z₂ = 1 + i, तो |(z₁ + z₂ + 1)/(z₁ − z₂ + i)|² का मान है

यदि z₁ = 2 − i और z₂ = 1 + i, तो |(z₁ + z₂ + 1)/(z₁ − z₂ + i)|² का मान है
  1. A88
  2. B1212
  3. C1616
  4. DMore than one of the aboveउपर्युक्त में से एक से अधिक
  5. ENone of the aboveउपर्युक्त में से कोई नहीं
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Correct answer: (A) 88

Explanation

z₁ + z₂ + 1 = 4 and z₁ − z₂ + i = 1 − 2i + i = 1 − i. So the modulus squared is 16/|1 − i|² = 16/2 = 8.z₁ + z₂ + 1 = 4 और z₁ − z₂ + i = 1 − 2i + i = 1 − i है। अतः मापांक का वर्ग 16/|1 − i|² = 16/2 = 8 है।

From BPSC TRE 1.0 (2023) Mathematics Class 11-12 — Previous Year Paper

This is question 49 of BPSC TRE 1.0 (2023) Mathematics Class 11-12 — Previous Year Paper. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.