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Evaluate:|12 5 -2|
|-3 0 1|
|-5 4 2|

It's going to be really confusing if I post my work. I got -127 from all the confusing things I did

  • Math -

    12 5 -2

    -3 0 1

    -5 4 2

    Expand the determinant along the second row:

    3 times det of

    5 -2

    4 2

    = 3* 18 = 54

    -1 times det of

    12 5

    -5 4

    = -73

    54 - 73 = -19

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