If A=[α22α] and |A3|=125, then α is equal to

1.	If A=[α22α] and \|A3\|=125, then α is equal to
Answer» If $A = [\begin{matrix} α & 2 2 & α \end{matrix}]$ and $\| A^{3} \| = 125$ , then $α$ is equal to

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