Matrices & Determinants
Inverse of a matrix
Grade 12

Question:

<p>If det(A)=3, then det(2\(A\)^{-1}) for 3 \times 3 matrix equals:</p>
8/3
2/3
4/3
1/3

Step-by-Step Solution

Key Concept: det(2A^{-1}) = 2^3 \times det(A$^{-1}) = 8 \times (1/3).
1. det(A$^{-1})=1/3 2. det(2$A$^{-1})=$2^3$ \times (1/3)=8/3
Correct Answer: 1

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