What is the first step in finding the determinant of a 3x3 matrix using the shortcut method?

Determinants of Matrices and Methods

Interactive Video
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Mathematics
•
7th - 10th Grade
•
Hard

Ethan Morris
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Write the second column twice.
Write the third column twice.
Write the first column twice.
Write the first row twice.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the shortcut method, what do you do after writing the columns twice?
Add all the numbers in the matrix.
Multiply the numbers diagonally from top left to bottom right.
Subtract the numbers diagonally from bottom left to top right.
Divide the numbers in the first column by the numbers in the second column.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of multiplying 5, 5, and 9 in the example provided?
225
125
275
325
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the final determinant value of the first example matrix?
424
737
-313
-737
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the practice example, what is the first column of the matrix?
8, 5, 7
4, 6, 9
3, -2, 8
5, 2, -6
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the determinant value of the practice example matrix?
575
-575
77
-77
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the older method mentioned in the video?
To find the determinant of a 5x5 matrix.
To find the determinant of a 2x2 matrix.
To find the determinant of a 6x6 matrix.
To find the determinant of a 4x4 matrix.
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