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9.3k views
in Mathematics by (70.5k points)

If A = [(2, -2, -4), (-1, 3, 4), (1, -2, x)]  is an idempotent matrix, then x is equal to ... 

(a) - 1 

(b) - 5 

(c) - 4 

(d) - 3

1 Answer

+1 vote
by (71.7k points)
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Best answer

The correct option (d) - 3

Explanation:

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