No 7 and 8

4 B C = w In Exercises 7-8, use the following matrices and either the row method or the column method, as appropriate, to find the indi- 5 cated row or column. E = 3 2 4 3 A = and B = DIE (b) D - E (c) 5A (e) 2B - C (f) 4E - 2D 7. (a) the first row of AB (b) the third row of AB 3(D + 2E) (h) A - A (i) tr( D) (c) the second column of AB (d) the first column of BA tr( D - 3E) (k) 4 tr(7B) (1) tr(A) (e) the third row of AA (f) the third column of AA 1.3 Matrices and Matrix Operations 37 8. (a) the first column of AB (b) the third column of BB In Exercises 15-16, find all values of k, if any, that satisfy the (c) the second row of BB (d) the first column of AA equation. (e) the third column of AB (f) the first row of BA 15. [k 1 In Exercises 9-10, use matrices A and B from Exercises 7-8