Matrices & Determinants
Properties of determinants
Grade 12

Question:

<p>If \(\det(A)\)=k, then det(A\)^{-1}\(A\)^TA^{-1}\(A) equals:</p>
k
1
k^2
0

Step-by-Step Solution

Key Concept: Simplify: $A$^{-1}$A$ = $I$ \Rightarrow expression reduces to $A$^TA^{-1}.
1. $A$^{-1}$A$ = $I$ 2. Expression becomes $A$^TA^{-1} 3. det = det(A$^T) \times det(A$^{-1})=k \times (1/k)=1
Correct Answer: 2

Master Matrices & Determinants with Mathbee

Practice this topic under real exam conditions with strict timers, or ask our AI Mentor to explain the concepts step-by-step.

Start Practicing for Free