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Ex 4.1, 8 (MCQ) - Chapter 4 Class 12 Determinants

Last updated at June 11, 2023 by

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Ex 4.1, 8 If |■8(x&2@18&x)| = |■8(6&2@18&6)| , then x is equal to (A) 6 (B) ±6 (C) −6 (D) 0 Given |■8(x&2@18&x)| = |■8(6&2@18&6)| Putting values x2 – 36 = 0 x2 – 62 = 0 (x – 6) (x + 6) = 0 Solving |■8(x&2@18&x)| = x(x) – 18(2) = x2 – 36 Solving |■8(6&2@18&6)| = 6(6) – 18(2) = 36 – 36 = 0 So , x = 6, x = –6 Hence value of x = ± 6 . Correct answer is B

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.