Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$D = | \begin{array} { l l l } { 1 } & { 1 } & { 0 } \\ { 0 } & { 2 A - 1 } & { 2 } \\ { 2 } & { - A } & { 1 } \end{array} |$$

Answer

D=-121

Solution


Simplify  \(1-122\)  to  \(-121\).
\[D=-121\]
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