If A=[2−1−12] and I is the unit matrix of order 2, then A2 is equa

1.	If A=[2−1−12] and I is the unit matrix of order 2, then A2 is equal to
Answer» If $A = [\begin{matrix} 2 & - 1 - 1 & 2 \end{matrix}]$ and $I$ is the unit matrix of order $2,$ then $A^{2}$ is equal to

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