Question: Need help with B2, B4 and B12 I don't understand them For Problems B 1-=B8, use row operations and triangular form to compute the determinants

Need help with B2, B4 and B12 I don't understand them

For Problems B 1-=B8, use row operations and triangular form to compute the determinants of the matrix. Show yopr work clearly. Decide Whether the matrix is invertible. '1' 3' 5i: 3 2 1 B1 32 7 85' B2 ~6 4 $1 5 2 9 6 -7 i 3 1 O 2 -4 -2 B3 :93 7 2 B4 1 6 3 6 1 1 2 8 2 i l 1 1 3 2 2 1 , '2 0 3 7 2 5 0 B5 3 1 2 8 B6 0 6 3 1 3 3 6 1 4 l 1 -2 1 2 1 5 4 . 1 3 2 3 1 3 8 B7 2 2 1 1 88 1 1 5 1 1 5 10 1 1 2 For Problems B9B 20, evaluate the determinant. 2 3 4 3 3 6 B9 1 1 4 B10 3 2 5 2 41 2 4 2 2 3 6 5 4 1 1 B11 5 5 5 B12 2 4 6 4 3 0 3 2 5 2 6 7 l

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