Help please I don't understand what to do

I am working on a Lab for my class where I am supposed to be finding

E1 = null(M-3I_5)

E2 = null((M-2I_5)^2)

E3 = null(M^2+1I_5)

I am having issues as all I am getting are 5x0 empty double arrays. I am supposed to use what i find in the next question. Like E1 = Span{v1} E2 = Span{v2,v3} E3 = {v4,v5}. In the next question X=[v1,v2,v3,v4,v5] in the equation X^-1*M*X. Array M equals [3,-3,1,3,-2;0,1,0,3,-2;0,-2,3,3,-2;0,0,0,2,0;0,1,0,2,-1]. Any help anyone can gove would be great.

Thank You