If \( \quad A=\left[\begin{array}{ll}1 & -1 \\ 2 & -1\end{array}\right], \quad B=\left[\begin{ar....
If \( \quad A=\left[\begin{array}{ll}1 & -1 \\ 2 & -1\end{array}\right], \quad B=\left[\begin{array}{cc}a & 1 \\ b & -1\end{array}\right] \) and \( (A+B)^{2} \)
P
\( =A^{2}+B^{2} \), then the values of \( a \) and \( b \) are:
(1) \( a=4, b=1 \)
(2) \( a=1, b=4 \)
(3) \( a=0, b=4 \)
(4) \( a=2, b=4 \)
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