inv {{10, -9, -12}, {7, -12, 11}, {-10, 10, 3}} - Wolfram|Alpha

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Input:

    EnlargeEnable InteractivityDownload as CDF
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    Result:

    EnlargeEnable InteractivityDownload as CDF

    Dimensions:

    EnlargeEnable InteractivityDownload as CDF

    Matrix plot:

    EnlargeEnable InteractivityDownload as CDF

    Characteristic polynomial:

    link to /input/?i=1%2F319-x%2F319-%28293+x%5E2%29%2F319-x%5E3&lk=1&a=ClashPrefs_*Math-
    EnlargeEnable InteractivityDownload as CDF

    Diagonalization:

    link to /input/?i=%7B%7B3.96326%2C+-0.301177%2C+-1.49542%7D%2C+%7B3.55353%2C+-2.20452%2C+0.0176585%7D%2C+%7B1%2C+1%2C+1%7D%7D&lk=1&a=ClashPrefs_*Math-link to /input/?i=%7B%7B-0.91128%2C+0%2C+0%7D%2C+%7B0%2C+-0.0623697%2C+0%7D%2C+%7B0%2C+0%2C+0.0551548%7D%7D&lk=1&a=ClashPrefs_*Math-link to /input/?i=%7B%7B0.135889%2C+0.0730296%2C+0.201922%7D%2C+%7B0.216223%2C+-0.333806%2C+0.329239%7D%2C+%7B-0.352113%2C+0.260777%2C+0.468839%7D%7D&lk=1&a=ClashPrefs_*Math-
    EnlargeEnable InteractivityDownload as CDF

    Download full output as:

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