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CBSE Class 12-science Answered

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Here why we are post-multiplying only, the inverse of the given matrix in the second step of the answer... But why not pre-multiplyijng?? Please explain me the logic.... why the answer will be wrong when pre-multipled??
Asked by nitishkrnehu09 | 14 Nov, 2017, 08:16: PM
answered-by-expert Expert Answer
begin mathsize 16px style Here comma space according space to space the space question PA equals straight B space and space we space have space to space find space out space straight A to the power of negative 1 end exponent. In space this space case space we space post minus multiply space by space straight A to the power of negative 1 end exponent space so space that space straight A to the power of negative 1 end exponent straight A equals straight I PA equals straight B PAA to the power of negative 1 end exponent equals BA to the power of negative 1 end exponent straight P open parentheses AA to the power of negative 1 end exponent close parentheses equals BA to the power of negative 1 end exponent PI equals BA to the power of negative 1 end exponent straight P equals BA to the power of negative 1 end exponent In space case space of space AP equals straight B space and space we space have space to space find space out space straight A to the power of negative 1 end exponent. We space pre minus multiply space by space straight A to the power of negative 1 end exponent space so space that space straight A to the power of negative 1 end exponent straight A equals straight I. AP equals straight B straight A to the power of negative 1 end exponent AP equals straight A to the power of negative 1 end exponent straight B open parentheses straight A to the power of negative 1 end exponent straight A close parentheses straight P equals straight A to the power of negative 1 end exponent straight B IP equals straight A to the power of negative 1 end exponent straight B straight P equals straight A to the power of negative 1 end exponent straight B Hope space this space clarifies space your space doubt. end style
Answered by Sneha shidid | 07 Dec, 2017, 02:19: PM

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CBSE 12-science - Maths
If 3 2x-7 4 5x-7 1 2x-5 4 x-1 -1 is a skew- symmetric matrix then x is equal to:
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  begin mathsize 12px style If space straight A to the power of straight T space equals space open square brackets table row 1 cell negative 1 end cell 2 row 4 3 cell negative 2 end cell end table close square brackets space space and space space straight B space equals space open square brackets table row 2 cell negative 3 end cell row 1 cell negative 4 end cell row 2 cell negative 2 end cell end table close square brackets space then space show space that space open parentheses straight A space plus space straight B close parentheses to the power of straight T space equals space straight A to the power of straight T space end exponent plus space straight B to the power of straight T end style
Asked by Topperlearning User | 21 Sep, 2017, 11:38: AM
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CBSE 12-science - Maths
  begin mathsize 12px style If space straight A to the power of straight T space end exponent equals space open square brackets table row 1 cell negative 1 end cell 2 row 4 3 cell negative 2 end cell end table close square brackets space and space straight B space equals space open square brackets table row 2 cell negative 3 end cell row 1 cell negative 4 end cell row 2 cell negative 2 end cell end table close square brackets space then space show space that space left parenthesis straight A space minus space straight B space right parenthesis to the power of straight T space equals space straight A to the power of straight T space minus space straight B to the power of straight T end style
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CBSE 12-science - Maths
  begin mathsize 12px style For space the space matrices space straight A space equals space open square brackets table row 2 7 cell negative 1 end cell row 3 cell negative 1 end cell 4 end table close square brackets space and space straight B space equals space open square brackets table row 1 cell negative 2 end cell row cell negative 4 end cell 0 row 3 1 end table close square brackets space verify space that space left parenthesis AB right parenthesis to the power of straight T space equals space straight B to the power of straight T straight A to the power of straight T end style
Asked by Topperlearning User | 21 Sep, 2017, 12:13: PM
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