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Linear AlgebraHardDeterminants & Inverses

Determinants & Inverses · Hard problem

AA is a 3×33\times3 matrix with det⁡A=−2\det A = -2. Find det⁡(adj⁡(2A))\det\big(\operatorname{adj}(2A)\big), where adj⁡\operatorname{adj} denotes the adjugate (classical adjoint).