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Mathematics · 2023 · 1 mark
CBSE 2023 · Region 1 · Set 1 · Q1
If for a square matrix A, A^2-3 A + I = O and A^-1= xA + yI, then the value of x + y is:
If for a square matrix $\displaystyle \mathrm{A}, \mathrm{A}^{2}-3 \mathrm{~A}+\mathrm{I}=\mathrm{O}$ and $\displaystyle \mathrm{A}^{-1}=\mathrm{xA}+\mathrm{yI}$, then the value of $\displaystyle \mathrm{x}+\mathrm{y}$ is :
Official answer
(B)
$\displaystyle 2$
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CBSE Class 12 Mathematics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.