- #1
Mathematicsss
Homework Statement
Verify that A^2-2A+7I=0
Homework Equations
A is a squared matrix and I is the identity matrix.
The Attempt at a Solution
I squared a matrix, which I called A, by multiplying the two A matrices together, then I subtracting the new matrix with the third matrix 2A, then I added 7I , however I did not get the zero matrix, why is that?
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