Question

Find the tr(A) such that (A^t- 5I)= B where I is a 2 x 2 identity matrix

where B is 0 1
-1 0

Answer 1

A^t - 5I = B

A^t = B+5I

Answer 2

find A^t first

Answer 3

Well the tr(A)=tr(the transpose of A)

Answer 4

so just add B+5I
and find the tr(transpose of A) and you are done

Answer 5

well I didn't know I could do "algebra" with matrices. I thought normal rule didn't apply

Answer 6

oh sorry! its (a^t-I5)^-1 :/