# Misc. 9 - Chapter 3 Class 12 Matrices (Term 1)

Last updated at Jan. 17, 2020 by Teachoo

Chapter 3 Class 12 Matrices (Term 1)

Serial order wise

Last updated at Jan. 17, 2020 by Teachoo

Hello! We hope that the questions explained by Teachoo are helping you for your Board exams. If Teachoo has been of any help to you, would you consider making a donation to support us? Please click on this link to support us.

Hello! We hope that the questions explained by Teachoo are helping you for your Board exams. If Teachoo has been of any help to you, would you consider making a donation to support us? Please click on this link to support us.

Misc 9 Find x, if [x -5 -1] [■8(1&0&2@0&2&1@2&0&3)] [■8(𝑥@4@1)] = O 〖"[x −5 −1]" 〗_(1×3) [■8(1&0&2@0&2&1@2&0&3)]_(3×3) [■8(𝑥@4@1)]_(3×1) = O 〖"[x(1) + (−5) (0) + (–1)(2) x(0) +(– 5) (2) + (−1)0 x(2) + (– 5)(1) + (−1)(3)]" 〗_(1×3) [■8(𝑥@4@1)] = O 〖"[x + 0 – 2 0 – 10 + 0 2x – 5 − 3]" 〗_(1×3) [■8(𝑥@4@1)]_(3×1)= O 〖"[x – 2 – 10 2x – 8]" 〗_(1×3) [■8(𝑥@4@1)]_(3×1) = O 〖"[(x – 2)(x) + (−10) (4) + (2x − 8) (1)]" 〗_(1×1) = O (x– 2)x – 10 (4) + 2x – 8 (1) = 0 x2 – 2x – 40 + 2x – 8 = 0 x2 + 0 – 48 = 0 x2 – 48 = 0 x2 = 48 x = ±√48 x = ±√(4 × 4 × 3) x = ± 4√3 Hence, x = ± 4√𝟑