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Find the value of x, if |(2,4),(5,1)|=|(2x, 4), (6,x)|.

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Question

Find the value of x, if `|(2,4),(5,1)|=|(2x, 4), (6,x)|`.

Sum
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Solution

`|(2,4),(5,1)|=|(2x, 4), (6,x)|`

⇒ 2 × 1 − 5 × 4 = 2x × x − 6 × 4

⇒ 2 − 20 = 2x2 − 24

⇒ −18 = 2x2 − 24

⇒ 2x2 − 24 + 18

⇒ 2x2 − 6

⇒ 2x2 = 6

⇒ `x^2 = 6/2`

⇒ x2 = 3

⇒ x = `± sqrt3`

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Chapter 4: Determinants - Exercise 4.1 [Page 109]

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NCERT Mathematics Part 1 and 2 [English] Class 12
Chapter 4 Determinants
Exercise 4.1 | Q 7.1 | Page 109
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