hi i worked out a matrix of this form

call lambda x

(2-x ) 0 3

0 (6-x) -3

3 -3 (2-x)

and that formula below was what i got

-x^3 + 10x^2 - 10x - 48

but this doesnt look right as i cant find the roots. I would be really grateful if someone would verify i have worked it out correctly.