Matrices
AP Precalculus · Flashcards · Application
AP PRECALCULUS · FLASHCARDS
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QUESTION
Find the result of
(
1
0
0
1
)
×
(
5
6
7
8
)
\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix} \times \begin{pmatrix} 5 & 6 \\ 7 & 8 \end{pmatrix}
(
1
0
0
1
)
×
(
5
7
6
8
)
.
QUESTION
Calculate the sum of matrices
(
1
2
3
4
)
\begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}
(
1
3
2
4
)
and
(
4
3
2
1
)
\begin{pmatrix} 4 & 3 \\ 2 & 1 \end{pmatrix}
(
4
2
3
1
)
.
QUESTION
Find the trace of matrix
(
1
2
3
4
)
\begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}
(
1
3
2
4
)
.
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ANSWER
5. Trace equals sum of diagonal elements:
1
+
4
=
5
1+4=5
1
+
4
=
5
.
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