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Matrices (p-1) — Maths (commerce) STD 12 Commerce / Arts — Question

Maharashtra BoardEnglish MediumSTD 12 Commerce / ArtsMaths (commerce)Matrices (p-1)1 Mark
Question
If $A =\left[\begin{array}{ll}2 & 1 \\ 1 & 1\end{array}\right]$ and $A ^{-1}=\left[\begin{array}{cc}1 & -1 \\ x & 2\end{array}\right]$, then $x =$__________
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Answer

-1

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