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Question
If A = `[(7, 0, x), (0, 7, 0), (0, 0, y)]` is a scalar matrix, then yx is equal to ______.
Options
0
1
7
± 7
MCQ
Fill in the Blanks
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Solution
If A = `[(7, 0, x), (0, 7, 0), (0, 0, y)]` is a scalar matrix, then yx is equal to 1.
Explanation:
A = `[(7, 0, x), (0, 7, 0), (0, 0, y)]`
Since A is a scalar matrix.
∴ x = 0 and y =7
Now yx = 70 = 1
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