Find a \( 2 \times 2 \) matrix B such that B \( \left[\begin{array}{rr}1 & -2 \\ 1 & 4\end{array...

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Find a \( 2 \times 2 \) matrix B such that B \( \left[\begin{array}{rr}1 & -2 \\ 1 & 4\end{array}\right]=6 I_{2} \).
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