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question is written in this pic with my solution.. however my ans doesnt match with the correct answer.. where am I gonig wrong??

question is written in this pic with my solution.. however my ans doesnt match with the correct answer.. where am I gonig wrong??

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Grade:12

2 Answers

Aditya Gupta
2081 Points
4 years ago
Dear muskan, your very first step itself is wrong.
Note that the only Valid row/column operations which leave the value of a determinant unchanged are of the form:
Ri --- Ri + mRj + nRk where m and n are constants.
Or Ci --- Ci + mCj + nCk
Since you have written R2 --- 2R2 - R1- R3, it is wrong because of the '2' in front of the row on which row operation is being applied, namely R2. 
Vikas TU
14149 Points
3 years ago
Dear student 
Please ask single question in a thread , 
It will be easier for us to ans. 
Good Luck 
Cheers 

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