CBSE 2023 · Region 1 · Set 1 · Q4 · 1 mark
If $\displaystyle \mathrm{A}=\left[\begin{array}{ll}3 & 4 \\ 5 & 2\end{array}\right]$ and $\displaystyle 2 \mathrm{~A}+\mathrm{B}$ is a null matrix, then B is equal to :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle \left[\begin{array}{cc}-6 & -8 \\ -10 & -4\end{array}\right]$
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CBSE Class 12 Mathematics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.