Page 102 - ADVANCED MATH F.5

Form Five Form Five

Minors, cofactors, and determinant of a 3×3 matrix
Teaching steps
1. Guide students in groups to search and discuss the meaning of
minors and cofactors of a 33× matrix using the Student’s Book
FOR ONLINE READING ONLY
and other resources as suggested.

2. Use Example 5.44 in the Student’s Book to guide students to
discuss the minors and cofactors of a 33× matrices. Engage
students in groups to use scientific calculators or Maple to
verify the answers of the given examples. Advise students to
share their work for more inputs.
3. Design an activity for exploring the concept of determinant of
a 33× matrix in the Student’s Book. Furthermore, create group
activities which will involve students in outlining the steps that
can be used in determining the determinant of a 33× matrix.
Advise students to share their work with other groups for more
inputs.

4. In groups, guide students to discuss Examples 5.45 and 5.46 in
the Student’s Book.
5. Require students to attempt Exercise 5.7 in the Student’s Book.
Advise students to submit their work. Check the correctness of
their answers, and give them constructive feedback.

Answers to Exercise 5.7

1. (a) –532 (b) 380

2. (a)  − 16 8 − 34 (b)  7 − 9 − 10
 − 14 − 46 63   1 − 12 − 5 
   
 − 24 12 2   − 10 − 5 0 
   

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Mathematics for Advanced Secondary Schools

30/06/2024 18:02:21
ADVANCED MATH F.5 TG CHAPTERS.indd 96
ADVANCED MATH F.5 TG CHAPTERS.indd 96 30/06/2024 18:02:21