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Grade 12Vectors

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 for question is written in this pic with my solution.

muskan

6 Years agoGrade 12

2 Answers

Aditya Gupta

Approved Tutor Answer6 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

6 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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