Q80
The inverse of the 2 × 2 matrix \[ [ array*20c 1&2 \\ 5&7 array ]\] is
The inverse of the 2 × 2 matrix \left[ {\begin{array}{*{20}{c}}
1&2 \\
5&7
\end{array}} \right] is
A.
\frac{1}{3}\left[ {\begin{array}{*{20}{c}}
{ - 7}&2 \\
5&{ - 1}
\end{array}} \right]
AnswerB.
\frac{1}{3}\left[ {\begin{array}{*{20}{c}}
7&2 \\
5&1
\end{array}} \right]
C.
\frac{1}{3}\left[ {\begin{array}{*{20}{c}}
7&{ - 2} \\
{ - 5}&1
\end{array}} \right]
D.
\frac{1}{3}\left[ {\begin{array}{*{20}{c}}
{ - 7}&{ - 2} \\
{ - 5}&{ - 1}
\end{array}} \right]
Answer: Option A
Solution
Answer: Option A
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