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