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Mathematics
Problem
For the diagonal matrix
A
=
(
2
0
0
0
−
1
0
0
0
4
)
A=\begin{pmatrix}2&0&0\\0&-1&0\\0&0&4\end{pmatrix}
A
=
2
0
0
0
−
1
0
0
0
4
, what is the
(
2
,
2
)
(2,2)
(
2
,
2
)
element of
A
−
1
A^{-1}
A
−
1
? a)
4
4
4
b)
−
1
-1
−
1
c)
−
1
4
-\dfrac14
−
4
1
d)
1
1
1
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