Determine the values of `lamda` for which the following system of equations fail to have a unique solution: `lamda x + 3y - z = 1, x + 2y + z = 2, - lamdax + y + 2z = -1`

Explanation

`Delta=0`



`[
[lambda ,3 , -1],
[1, 2, 1],
[-lambda , 1 , 2]]=0`



`lambda(4-1)-3(2+lambda)-1(1+2 lambda)=0 `
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