Question

Find the value of each determinant:
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Answer 1

Matrix 1: -4269

Matrix 2: 1768

Matrix 3: 647.3561

Explanation:

Matrix 1:
`(7*19)-(31*142)=-4269`

Matrix 2: 1768

`\left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&i\end{array}\right]`

Determinant =
`a(ei-fh)-b(di-fg)+c(dh-eg)`

Matrix 3: 647.3561

`\left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&i\end{array}\right]`

Determinant =
`a(ei-fh)-b(di-fg)+c(dh-eg)`