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Q. If $a + ib = c + id$, then

Complex Numbers and Quadratic Equations

Solution:

$a + ib = c + id$
$\therefore \, \left|a+ib\right|=\left|c+id\right|$
$\Rightarrow \, a^{2}+b^{2}=c^{2}+d^{2}$