If A= [ array ccc 1 & 0 & 2 2 & 1 & 3 0 & 3 & -5 array ] , where A_ ij is the cofactor of the element a_ ij of matrix A , then a₂₁ A₂₁+a₂₂ A₂₂+a₂₃ A₂₃=

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Quantrex Academy · Accepted Answer

Correct answer: C. -2

aligned a₂₁ & A₂₁+a₂₂ A₂₂+a₂₃ A₂₃ &=-2(0-6)+1(-5-0)-3(3-0) &=12-5-9=-2 aligned

If A= [ array ccc 1 & 0 & 2 2 & 1 & 3 0 & 3 & -5 array ] , where A_ ij is the cofactor of the element a_ ij of matrix A , then a₂₁ A₂₁+a₂₂ A₂₂+a₂₃ A₂₃=

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