| cc a+i b & c+i d -c+i d & a-i b |= - Vidyadip

MCQ

$\left|\begin{array}{cc}a+i b & c+i d \\ -c+i d & a-i b\end{array}\right|=$

A
$(a+b)^2$
B
$(a+b+c+d)^2$
C
$\left(a^2+b^2-c^2-d^2\right)$
✓
$a^2+b^2+c^2+d^2$

✓

Answer

Correct option: D.

$a^2+b^2+c^2+d^2$

(d): We have, $\left|\begin{array}{cc}a+i b & c+i d \\ -c+i d & a-i b\end{array}\right|$

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