3 and 4 .Determinants and Matrices
easy

જો $A = \left[ {\begin{array}{*{20}{c}}4&2\\{ - 1}&1\end{array}} \right]$અને $I $ એ $2 $ કક્ષાનો એકમ શ્રેણિક છે , તો $(A - 2I)(A - 3I) = $

A

$I$

B

$O$

C

$\left[ {\begin{array}{*{20}{c}}1&0\\0&0\end{array}} \right]$

D

$\left[ {\begin{array}{*{20}{c}}0&0\\0&1\end{array}} \right]$

Solution

(b) $(A – 2I)\,(A – 3I) = \left[ {\begin{array}{*{20}{c}}2&2\\{ – 1}&{ – 1}\end{array}} \right]\,\left[ {\begin{array}{*{20}{c}}1&2\\{ – 1}&{ – 2}\end{array}} \right]\, = \,\left[ {\begin{array}{*{20}{c}}0&0\\0&0\end{array}} \right] = O$.

Standard 12
Mathematics

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