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Q. $\left(\sqrt[3]{3}+\left(3^{5 / 6}\right) i\right)^{3}$ is an integer where $i=\sqrt{-1}$. The absolute value of the integer is equal to

Complex Numbers and Quadratic Equations

Solution:

Solving, $\left[3^{1 / 3}(1+\sqrt{3} i)\right]^{3}=3(1+\sqrt{3} i)^{3}$
$=3 \cdot 8\left(\cos \frac{\pi}{3}+i \sin \frac{\pi}{3}\right)^{3}=-24$