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Problems
Let
A
=
(
2
−
1
3
0
4
5
)
,
B
=
(
1
0
−
2
3
4
−
1
)
A = \begin{pmatrix} 2 & -1 & 3 \\ 0 & 4 & 5 \end{pmatrix},\quad B = \begin{pmatrix} 1 & 0 \\ -2 & 3 \\ 4 & -1 \end{pmatrix}
A
=
(
2
0
−
1
4
3
5
)
,
B
=
1
−
2
4
0
3
−
1
…
Mathematics
Problem
Let
A
=
(
2
−
1
3
0
4
5
)
,
B
=
(
1
0
−
2
3
4
−
1
)
A = \begin{pmatrix} 2 & -1 & 3 \\ 0 & 4 & 5 \end{pmatrix},\quad B = \begin{pmatrix} 1 & 0 \\ -2 & 3 \\ 4 & -1 \end{pmatrix}
A
=
(
2
0
−
1
4
3
5
)
,
B
=
1
−
2
4
0
3
−
1
. Find the element in the second row and second column of the product
A
B
AB
A
B
. a)
14
14
14
b)
7
7
7
c)
12
12
12
d)
−
7
-7
−
7
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