If \({\rm{A}} = \left[ {\begin{array}{*{20}{c}} {\rm{\alpha }}&2\\ 2&{\rm{\alpha }} \end{array}} \right]\) and det (A3) = 125, then α is equal to

If \({\rm{A}} = \left[ {\begin{array}{*{20}{c}} {\rm{\alpha }}&2\\ 2&{

1.	If \({\rm{A}} = \left[ {\begin{array}{*{20}{c}} {\rm{\alpha }}&2\\ 2&{\rm{\alpha }} \end{array}} \right]\) and det (A3) = 125, then α is equal to
A.	± 1
B.	± 2
C.	± 3
D.	± 5
Answer» D. ± 5

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If \({\rm{A}} = \left[ {\begin{array}{*{20}{c}} {\rm{\alpha }}&2\\ 2&{\rm{\alpha }} \end{array}} \right]\) and det (A3) = 125, then α is equal to

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