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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

જો \(A\) એ શ્રેણિક છે કે જેથી \(A.\,\left[ {\begin{array}{*{20}{c}}
1&2\\
0&3
\end{array}} \right]\) એ અદિશ શ્રેણિક છે અને \(\left| {3A} \right| = 108\) . તો \(A^2\) મેળવો.

  1. A \(\left[ {\begin{array}{*{20}{c}} 4&{ - 32}\\ 0&{36} \end{array}} \right]\)
  2. B \(\left[ {\begin{array}{*{20}{c}} 4&0\\ { - 32}&{36} \end{array}} \right]\)
  3. C \(\left[ {\begin{array}{*{20}{c}} {36}&0\\ { - 32}&4 \end{array}} \right]\)
  4. D \(\left[ {\begin{array}{*{20}{c}} {36}&{ - 32}\\ 0&4 \end{array}} \right]\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\left[ {\begin{array}{*{20}{c}} {36}&{ - 32}\\ 0&4 \end{array}} \right]\)

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Detailed explanation

\((d)\) Since \(A.\left[ {\begin{array}{*{20}{c}} 1&2\\ 0&3 \end{array}} \right]\) is a scalar matrix and \(\left| {3A} \right| = 108\) Suppose the scalar matrix is \(\left[ {\begin{array}{*{20}{c}} k&0\\ 0&k \end{array}} \right]\)…
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