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Question
Find the value (s) of x, if `|(1, 2x, 4x),(1, 4, 16),(1, 1, 1)|` = 0
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Solution
`|(1, 2x, 4x),(1, 4, 16),(1, 1, 1)|` = 0
∴ 1(4 – 16) – 2x(1 – 16) + 4x(1 – 4) = 0
∴ 1(– 12) – 2x(–15) + 4x(– 3) = 0
∴ – 12 + 30x – 12x = 0
∴ 18x = 12
∴ x = `12/18= 2/3`
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