alleryFor A = [[2,0],[0,3]] (diagonal matrix), A² equals:
A[[2,0],[0,3]]
B[[4,0],[0,9]]
C[[4,9],[0,0]]
D[[0,0],[6,0]]
Answer & Solution
Correct answer: B. [[4,0],[0,9]]
For diagonal matrix, A² has diagonal entries squared: [[2²,0],[0,3²]] = [[4,0],[0,9]].
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