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Question
Find K if the following matrices are singular.
`[(7, 3),(-2, "K")]`
Solution
Let A = `[(7, 3),(-2, "K")]`
Since A is a singular matrix,
|A| = 0
∴ `|(7, 3),(-2, "K")|` = 0
∴ 7K + 6 = 0
∴ 7K = – 6
∴ K = `(-6)/(7)`.
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