Question:

Find the signed minor of the element e(subscript 12) in the determinant:?

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-3 2 4

-1 -4 5

-2 1 6

a. - 4

b 7

d -7

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  1. It's a.

    Sign is -1 since the 2 is in the second spot.

    minor is

    | -1 5 |

    | -2 6 | = (-1)(6) - (5)(-2) = -6 - (-10) = 4

    Multiply it by the sign to get:

    -1 * 4 = -4.

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