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Model Paper 2 — MATHS STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceMATHSModel Paper 21 Mark
Question
For any $2-$ rowed square matrix $A,$ if $A \cdot(\operatorname{adj} A)=\left[\begin{array}{ll}8 & 0 \\ 0 & 8\end{array}\right]$ then the value of $| A |$ is
✓

Answer

$(a) \ 8$
$(\operatorname{adj} A)=\left(\begin{array}{ll} 8 & 0 \\ 0 & 8 \end{array}\right) $
$ =8\left(\begin{array}{ll} 1 & 0 \\0 & 1\end{array}\right) $
$=|A| I $
$|A|=8$

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