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Question

If A = [ array*20c 1&3 + x&2 1 - x&2&y + 1 2&5 - y&3 array ] is a symmetric matrix, then 3x + y is equal to?

Options

Choose one · Correct answer highlighted

Explanation

We can see that after simplifying, -1 is left. The method is simple: formula → substitution → calculation → answer.

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