If \( A=\left[\begin{array}{ll}\alpha & 0 \\ 1 & 1\end{array}\right] \) and \( B=\left[\begin{ar....

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If \( A=\left[\begin{array}{ll}\alpha & 0 \\ 1 & 1\end{array}\right] \) and \( B=\left[\begin{array}{ll}1 & 0 \\ 5 & 1\end{array}\right] \), then the value of ' \( \alpha \) '
\( \mathrm{P} \)
for which \( A^{2}=B \), is
(1) 1
(2) -1
(3) 4
(4) No real values


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