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If A = [[2, 0], [0, 3]], then A squared equals:
A[[2, 0], [0, 9]]
B[[4, 6], [6, 9]]
C[[4, 0], [0, 6]]
D[[4, 0], [0, 9]]
Answer & Solution
Correct answer: D. [[4, 0], [0, 9]]
For a diagonal matrix the diagonal entries are squared, giving 4 and 9.
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