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Question
If the value of determinant `|[m,2],[-5,7]|`is 31, find the value of m
Solution
`|[m,2],[-5,7]|=31`
∴(m × 7) – (–5 × 2) = 31
∴7m – (–10) = 31
∴7m + 10 = 31
∴7m = 21
∴m = 3
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