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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 3 · Set 1 · Q2
If A^2=4 A +3 I and A^-1= xA + yI, then the value of ( x + y ) is:
If $\displaystyle \mathrm{A}^{2}=4 \mathrm{~A}+3 \mathrm{I}$ and $\displaystyle \mathrm{A}^{-1}=\mathrm{xA}+\mathrm{yI}$, then the value of $\displaystyle (\mathrm{x}+\mathrm{y})$ is :
Official answer
(A)
$\displaystyle - 1$
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CBSE Class 12 Mathematics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.