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CBSE Class 12-science Answered

Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '.
Asked by vatsala srivastava srivastava | 16 Jun, 2014, 10:06: PM
answered-by-expert Expert Answer
w e space k n o w space t h a t space a d j o i n t space o f space m a t r i x space i s space e q u a l s space t o X. open square brackets a d j. X close square brackets equals open vertical bar X close vertical bar. I i f space d e t e r m i n a n t space o f space a space m a t r i x space i s space e q u a l s space t o space 1 space t h e n space f o l l o w i n g space p r o p o r t i e s space h o l d s space X. open square brackets a d j. X close square brackets equals 1. I M u l t i p l y i n g space o n space b o t h space s i d e s space b y space X to the power of minus 1 end exponent space w e space g e t open square brackets a d j. X close square brackets equals X to the power of minus 1 end exponent space a n d space open square brackets a d j. X to the power of minus 1 end exponent close square brackets equals X H e r e space X space i s space P space a n d space Q S o space a d j. P to the power of minus 1 end exponent equals P comma space space a d j. space Q to the power of minus 1 end exponent equals Q a d j. open parentheses X Y close parentheses equals space a d j. Y space a d j. X a d j open parentheses Q to the power of minus 1 end exponent B P to the power of minus 1 end exponent close parentheses equals a d j. P to the power of minus 1 end exponent space a d j. B space a d j space Q to the power of minus 1 end exponent S u b s t i t u t i n g space t h e space v a l u e s space f r o m space t h e space a b o v e space r e l a t i o n s space w e space g e t space a d j open parentheses Q to the power of minus 1 end exponent B P to the power of minus 1 end exponent close parentheses equals a d j. P to the power of minus 1 end exponent space a d j. B space a d j space Q to the power of minus 1 end exponent space equals space P A Q
Answered by Dharma Teja | 17 Jun, 2014, 12:46: PM

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CBSE 12-science - Maths
Example 17 Solve the following system of equations by matrix method. 3x-2y+3z =8 2x+y-z=1 4x-3y+2z = 4
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CBSE 12-science - Maths
quikly
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CBSE 12-science - Maths
value of X if [xy+2z-3]+[y 4 5]=[4 9 12]
Asked by ronitrawat267 | 30 Sep, 2020, 09:16: AM
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CBSE 12-science - Maths
Let  f (x) = x2  – 5 x + 6  and  A =            1 1 0 2 1 3 2 0 1  , then  f (A) is equal to : (A)                   5 4 4 1 1 10 1 1 3 (B)                   5 4 3 1 1 10 1 1 3 (C)                  5 4 3 0 1 10 0 1 3 (D)      
Asked by vikaskumawat037 | 09 Sep, 2020, 09:58: PM
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CBSE 12-science - Maths
[a-b. 2a+c]=[-1 5].  [2a-b. 3c+2]=[0 13]. Find the a b c and d
Asked by madankumar47 | 02 Jun, 2020, 12:49: PM
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