Math. 225 - Quiz 5
October 15, 2009
Use both sides of the paper if necessary Compute the determinant of the following matrices 102 (a)3 7 0 1 6 2 Solution: Expand along row one: 102 70 3 7 det 3 7 0 = 1.det +2.dett = 1(14)+2(187) = 64 . 6 2 16 1 6 2 11 1
Math. 225 - Quiz 3
September 17, 2009
Use both sides of the paper if necessary (1) Let A = 3 1 20 . and b = 8 2 3 7
(a) Re-write the matrix equation AX = b as a vector equation. [Hint: use the columns of A]. 1 3 (b) Given that X = 1 and X = 0 are both sol