- #1
mr_coffee
- 1,629
- 1
Hello everyone I'm suppose to find a k, that will make this matrix singular, well i looked up what that ment, and it means i have to make the determinant 0. So i the matrix is:
-3 2 1
-9 8 3
(9+k) 2 0
so i found a random minor, say M13..
so i would have
-9 8
(9+k) 2
det = (-9)(2) - [8(9+k)] = -18 -72 -8k = -90 -8k;
so i want k to be 0, so i solve for k
-90 -8k = 0;
k = -90/8, i submitted it, and it was incorrect, any ideas why?
-3 2 1
-9 8 3
(9+k) 2 0
so i found a random minor, say M13..
so i would have
-9 8
(9+k) 2
det = (-9)(2) - [8(9+k)] = -18 -72 -8k = -90 -8k;
so i want k to be 0, so i solve for k
-90 -8k = 0;
k = -90/8, i submitted it, and it was incorrect, any ideas why?