[ * 20 c 1&3 3& 10 ]^ - 1 = - Vidyadip

MCQ

${\left[ {\begin{array}{*{20}{c}}1&3\\3&{10}\end{array}} \right]^{ - 1}} = $

A
$\left[ {\begin{array}{*{20}{c}}{10}&3\\3&1\end{array}} \right]$
✓
$\left[ {\begin{array}{*{20}{c}}{10}&{ - 3}\\{ - 3}&1\end{array}} \right]$
C
$\left[ {\begin{array}{*{20}{c}}1&3\\3&{10}\end{array}} \right]$
D
$\left[ {\begin{array}{*{20}{c}}{ - 1}&{ - 3}\\{ - 3}&{ - 10}\end{array}} \right]$

✓

Answer

Correct option: B.

$\left[ {\begin{array}{*{20}{c}}{10}&{ - 3}\\{ - 3}&1\end{array}} \right]$

b
(b) As $\left[ {\begin{array}{*{20}{c}}1&3\\3&{10}\end{array}} \right]\,\,\left[ {\begin{array}{*{20}{c}}{10}&{ - 3}\\{ - 3}&1\end{array}} \right] = \left[ {\begin{array}{*{20}{c}}1&0\\0&1\end{array}} \right]$.

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