
Cofactor and Determinant Concepts

Interactive Video
•
Mathematics
•
9th - 12th Grade
•
Hard

Jackson Turner
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the method used to find the determinant of a 3x3 matrix in this tutorial?
Cofactor Method
Row Reduction
Matrix Inversion
Gaussian Elimination
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a minor in the context of matrix determinants?
A matrix with all zero elements
The product of diagonal elements
The sum of all elements in a row
A smaller matrix formed by deleting a row and column
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is the cofactor of an element calculated?
By adding the row and column indices
By multiplying the element by its minor
By raising -1 to the power of the sum of its row and column indices and multiplying by its minor
By subtracting the element from its minor
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in using the cofactor method to find a determinant?
Multiply all elements by 2
Choose any row or column
Add all elements in the matrix
Transpose the matrix
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which element's minor is used first in the example calculation?
Element in Row 3, Column 3
Element in Row 2, Column 1
Element in Row 1, Column 1
Element in Row 1, Column 2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of the 2x2 determinant formed by eliminating Row 1 and Column 1?
11
-11
-22
0
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the power to which -1 is raised for the cofactor of the element in Row 1, Column 2?
1
4
3
2
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