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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??

Question Image
Grade:12

2 Answers

Aditya Gupta
2075 Points
one year 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
one year 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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