Diketahui matriks A= ![\left[\begin{array}{ccc}3&-7\\-5&9&\\\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D3%26-7%5C%5C-5%269%26%5C%5C%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}3&-7\\-5&9&\\\end{array}\right]")
dan B= ![\left[\begin{array}{ccc}5&6\\-11&-2&\\ \end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D5%266%5C%5C-11%26-2%26%5C%5C+%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}5&6\\-11&-2&\\ \end{array}\right]")
. jika AX=B, maka determinan matriks X adalah...
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X =
det X = Ia.d - b.cI
= I4. .-3 - (-5 . 1)I
= I - 12 + 5 I
= I - 7 I
= 7