(1) (Section 7.1 # 1) Let A be the matrix below0-2145 010 2(a) Compute (by hand) det(A) using cofactor expansion along the first row.(b) Compute (by hand) det(A) using cofactor expansion along the second row.(c) Compute (by hand) det (A) using cofactor expansion along the third row

Question
Asked Nov 12, 2019
24 views

please answer part (b)

(1) (Section 7.1 # 1) Let A be the matrix below
0
-2
1
4
5 0
1
0 2
(a) Compute (by hand) det(A) using cofactor expansion along the first row.
(b) Compute (by hand) det(A) using cofactor expansion along the second row.
(c) Compute (by hand) det (A) using cofactor expansion along the third row
help_outline

Image Transcriptionclose

(1) (Section 7.1 # 1) Let A be the matrix below 0 -2 1 4 5 0 1 0 2 (a) Compute (by hand) det(A) using cofactor expansion along the first row. (b) Compute (by hand) det(A) using cofactor expansion along the second row. (c) Compute (by hand) det (A) using cofactor expansion along the third row

fullscreen
check_circle

Expert Answer

Step 1

The given matrix A is,

-2 1 0
5 0
0 2
4
1
help_outline

Image Transcriptionclose

-2 1 0 5 0 0 2 4 1

fullscreen
Step 2

Compute in the following det (A) using cofactor expansion along the second row.

Determinant of matrix A
-2 1 0
9-9
-2 1
1 0
04
0 2
-2 0
+0
2
.(1)
5
1
1
0
0 2
1
4
help_outline

Image Transcriptionclose

Determinant of matrix A -2 1 0 9-9 -2 1 1 0 04 0 2 -2 0 +0 2 .(1) 5 1 1 0 0 2 1 4

fullscreen
Step 3

Now solve the abov...

1 0
1x2-0x0 2
2
-2 0
=-2x2-1x0 -4
1
2
-2 1
=-2x0-1x1 -1
0
1
help_outline

Image Transcriptionclose

1 0 1x2-0x0 2 2 -2 0 =-2x2-1x0 -4 1 2 -2 1 =-2x0-1x1 -1 0 1

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Math

Advanced Math