Find the value of the determinant.

StartAbsoluteValue Start 3 By 3 Matrix 1st Row 1st Column Upper A 2nd Column Upper B 3rd Column Upper C 2nd Row 1st Column negative 2 2nd Column 4 3rd Column 4 3rd Row 1st Column 4 2nd Column 0 3rd Column negative 4 EndMatrix EndAbsoluteValue

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Part 1
StartAbsoluteValue Start 3 By 3 Matrix 1st Row 1st Column Upper A 2nd Column Upper B 3rd Column Upper C 2nd Row 1st Column negative 2 2nd Column 4 3rd Column 4 3rd Row 1st Column 4 2nd Column 0 3rd Column negative 4 EndMatrix EndAbsoluteValue
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The determinant of the given matrix is -80.