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**FInd the determinant of the following matrix?**

4,-4,-8

-2, 2, 6

0, 0,-1

**Heres my attempt**

4.(2x(-1)- 6x0) -(-4).((-2)x(-1) - 6x0) +(-8).((-2)x0-2x0)

which goves:

4.(-2)+4(2) -8 = 0

is this correct??

Im also asked to find the trace? What is this and how do i find it?

Thanks