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If A and B are 3x3 matrixes, det (A) = -1, det (B) = -2, then what is det(-2A)?
2 Answers
Relevance
- Anonymous3 years ago
nono
- JulienLv 73 years ago
det(-2A) = det(-2Id.A) = det(-2Id)det(A) = (-2)^3 det(A) = -8
B is obviously irrelevant to compute det(-2A)
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