- #1
uzman1243
- 80
- 1
Homework Statement
A =
7 -5 0
-5 7 0
0 0 -6
Can you please show your method aswell. Every time I try I get the wrong answer.
FYI Eigen values are 12.2,-6
The Attempt at a Solution
so far I got:
det =
7-λ -5 0
-5 7-λ 0
0 0 -6-λ
Im unsure what to do next. I tried doing this
(7-λ) [(7-λ)*(-6-λ)] - (-5)(-5(-6-λ)) + 0 = 0
but when I expand and get a cubic equation and solve it, i don't get the right answer which is 12,2,-6