allery3A-2B=I, where I is the 2×2 identity and B=[[1,2],[0,1]]. Find A's top-right entry.
A3/2
B-4/3
C4/3
D2/3
Answer & Solution
Correct answer: C. 4/3
The top-right entry satisfies 3a-2×2=0, so a=4/3.
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