1.

If for the matrix A = \(\begin{bmatrix}\alpha & -2 \\[0.3em]-2 & -\alpha\end{bmatrix}\), |A3| = 125, then the value of α is :[(α,-2),(-2,-α)](a) ±3(b) -3(c) ±1(d) 1

Answer»

Option : (a) ±3



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