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Chapter 4 Class 12 Determinants

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Important Questions for exams Class 12

Ex 4.1, 7 - Chapter 4 Class 12 Determinants (Important Question)

Last updated at March 16, 2023 by

Ex 4.1, 7 - Find x if (i) |2 4 5 1| = |2x 4 6 x| - Determinants

Ex 4.1, 7 - Chapter 4 Class 12 Determinants - Part 2

 

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Transcript

Ex 4.1, 7 Find values of x, if (i) |■8(2&[email protected]&1)| = |■8(2x&[email protected]&x)|Calculating |■8(2&[email protected]&1)| = 2(1) – 5(4) = 2 – 20 = – 18 Calculating |■8(2x&[email protected]&x)| = 2x(x) – 6 × 4 = 2x2 – 24 Now |■8(2&[email protected]&1)| = |■8(2x&[email protected]&x)| Putting values −18 = 2x2 – 24 2x2 – 24 = −18 2x2 = −18 + 24 2x2 = 6 x2 = 6/2 x2 = 3 x = ± √𝟑 Hence, value of x is ± √3

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