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For A=[[2,-3],[4,0]] and identity matrix I, find I-A.

A[[-1,3],[-4,1]]
B[[-2,3],[-4,0]]
C[[-1,-3],[4,1]]
D[[1,3],[-4,0]]
Answer & Solution
Correct answer: A. [[-1,3],[-4,1]]
Subtracting corresponding entries from I gives [[-1,3],[-4,1]].
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