matrices

[aag2995]

if A is a square matrix and satisfises the relation A^2 - 5A + 7I = 0 where I is a identity matrix of orded 2 by 2 find A inverse...
please give full solution...asap

 

[tkhunny]

Please show any effort at all.

Hard way: Pick a, b, c, and d to populate your A and have at the algebra.