Medium MCQ +4 / -1 PYQ · JEE Mains 2022

If $z=2+3 i$, then $z^{5}+(\bar{z})^{5}$ is equal to :

  1. A 244 Correct answer
  2. B 224
  3. C 245
  4. D 265

Solution

<p>$z = (2 + 3i)$</p> <p>$\Rightarrow {z^5} = (2 + 3i){\left( {{{(2 + 3i)}^2}} \right)^2}$</p> <p>$= (2 + 3i){( - 5 + 12i)^2}$</p> <p>$= (2 + 3i)( - 119 - 120i)$</p> <p>$= - 238 - 240i - 357i + 360$</p> <p>$= 122 - 597i$</p> <p>${\overline z ^5} = 122 + 597i$</p> <p>${z^5} + {\overline z ^5} = 244$</p>

About this question

Subject: Mathematics · Chapter: Complex Numbers and Quadratic Equations · Topic: Complex Numbers and Argand Plane

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