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1. |
If α and β are the roots of the equation 1 + x + x2 = 0, then the matrix product\(\left[ {\begin{array}{*{20}{c}} 1&\beta \\ \alpha &\alpha \end{array}} \right]\;\left[ {\begin{array}{*{20}{c}} \alpha &\beta \\ 1&\beta \end{array}} \right]\) is equal to |
A. | \(\left[ {\begin{array}{*{20}{c}} 1&1\\ 1&2 \end{array}} \right]\) |
B. | \(\left[ {\begin{array}{*{20}{c}} { - 1}&{ - 1}\\ { - 1}&2 \end{array}} \right]\) |
C. | \(\left[ {\begin{array}{*{20}{c}} 1&{ - 1}\\ { - 1}&2 \end{array}} \right]\) |
D. | \(\left[ {\begin{array}{*{20}{c}} { - 1}&{ - 1}\\ { - 1}&{ - 2} \end{array}} \right]\) |
Answer» C. \(\left[ {\begin{array}{*{20}{c}} 1&{ - 1}\\ { - 1}&2 \end{array}} \right]\) | |