- #1
songoku
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Homework Statement
Let B = [tex]\left(\begin{array}{cc}2&4\\1&2\end{array}\right)[/tex] and A be a matrix satisfying A2 = 0, AB = 0
1. Calculate (I+A) (I-A), I = identity
2. Calculate (I+A)-1 (I+2A)-1B
Homework Equations
The Attempt at a Solution
1. Ans = I
2.
In the manual, it's written : (I+2A)-1 = 1/4 (I-2A)
I don't understand how 1/4 pops up...
Thanks