iQ Level
MAT1503 ASSIGNMENT 03 SOLUTION 2026
UNISA
Due date: Friday, 31 July 2026
Total Marks: 20
ONLY FOR YEAR MODULE
This assignment covers chapters 1 & 2 of the prescribed book
as well as the study
, QUESTION 1
(a) Prove that det(Q) = ±1 for an orthogonal matrix
Given:
A matrix 𝑄is orthogonal if:
𝑄𝑇 𝑄 = 𝐼
Take determinant on both sides
det(𝑄 𝑇 𝑄) = det(𝐼)
Use determinant properties
• det(𝑄 𝑇 ) = det(𝑄)
MAT1503 ASSIGNMENT 03 SOLUTION 2026
UNISA
Due date: Friday, 31 July 2026
Total Marks: 20
ONLY FOR YEAR MODULE
This assignment covers chapters 1 & 2 of the prescribed book
as well as the study
, QUESTION 1
(a) Prove that det(Q) = ±1 for an orthogonal matrix
Given:
A matrix 𝑄is orthogonal if:
𝑄𝑇 𝑄 = 𝐼
Take determinant on both sides
det(𝑄 𝑇 𝑄) = det(𝐼)
Use determinant properties
• det(𝑄 𝑇 ) = det(𝑄)