Let A=[(x+lambda,x,x), (x,x+lambda,x), (...

Let `A=[(x+lambda,x,x), (x,x+lambda,x), (x,x,x+lambda)]` then `A^(-1)` exists if
A. `x ne 0`
B. Adj. `A ne 0`
C. `|A| ne 0`
D. `A^(-1) = |A| Adj. A`

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