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Misc. 9 - Chapter 3 Class 12 Matrices
Last updated at March 11, 2017 by Teachoo
Transcript
Misc. 9 Find x, if [x -5 -1] [ 8(1&0&2@0&2&1@2&0&3)] [ 8( @4@1)] = O "[x 5 1]" _(1 3) [ 8(1&0&2@0&2&1@2&0&3)]_(3 3) [ 8( @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( @4@1)] = O "[x + 0 2 0 10 + 0 2X 5 3]" _(1 3) [ 8( @4@1)]_(3 1)= O "[x 2 10 2x 8]" _(1 3) [ 8( @4@1)]_(3 1) = O "[(x 2)(x) + ( 10) (4) + (2x 8) (1) ]" _(1 1) = 0 (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
About the Author
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.