How do I find the determinant of a $2 \times 2$ $2xx2$ matrix?

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Answer 1 · 2015-03-02T14:38:53

Since a matrix $2 \times 2$ $2xx2$ is like this:

$∣ a$ $|a$ $b ∣$ $b|$
$∣ c$ $|c$ $d ∣$ $d|$ ,

the determinant is: $Delta=ad-bc$ .

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