Find the cofactor of the element 4 in the determinant [1 2 3; 4 5 6; 7 8 9]. A. 3 B. -3 C. 6 D. -6 Answer: C) 6 Explanation: Element 4 is a₂₁. Deleting row 2 and col 1 leaves |2 3; 8 9|. Minor M₂₁ = 18 - 24 = -6. Cofactor C₂₁ = (-1)³(-6) = 6.

imo class 12 determinants

Find the cofactor of the element 4 in the determinant [1 2 3; 4 5 6; 7 8 9].

VAVidaara Admin Asked 8d ago 0 views 0 answers

Find the cofactor of the element 4 in the determinant [1 2 3; 4 5 6; 7 8 9].

Answer: C) 6

Explanation: Element 4 is a₂₁. Deleting row 2 and col 1 leaves |2 3; 8 9|. Minor M₂₁ = 18 - 24 = -6. Cofactor C₂₁ = (-1)³(-6) = 6.

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