- #1
PsychonautQQ
- 784
- 10
Homework Statement
I = Identity matrix
Suppose that A^2 = A. Prove that I - 2A = (I - 2A)^-1
Homework Equations
ahh don't know what to put here
The Attempt at a Solution
So I have to prove this thing is it's own identity... interesting..
I - 2A = I - 2A^2
(I - 2A^2)*(I - 2A)^-1 = I
Distributive law?
Idk honestly this is all I have gotten.. And it's probably not the right direction, just trying to put all the information I know into one line I guess. Any Mathamavericks out there want to help a noob out?