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Evaluate: `|[a+ib, c+id],[-c+id, a-ib]|`

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Evaluate: `|[a+ib, c+id],[-c+id, a-ib]|`
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Correct Answer - `(a^(2) + b^(2)+c^(2)+d^(2))`
`Delta = (a+ib)(a-ib) -(c+id) (-c+id)
={a^(2)-(ib)^(2)} -{(id)^(2) -c^(2)} = (a^(2)+b^(2))-(-d^(2)-c^(2)) = (a^(2) + b^(2)+c^(2)+d^(2))`
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