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Question

Prove that ∣ ∣ ∣yzx2zxy2xyz2zxy2xyz2yzx2xyz2yzx2zxy2∣ ∣ ∣ is divisible by (x+y+z), and hence find the quotient
OR
Using elementary transformations, find the inverse of the matrix A=843211122 and use it to solve the following system of linear equations:
8x+4y+3z=19
2x+y+z=5
x+2y+2z=7

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Solution

A=843211122
AA1=I
843211122A1=100010001

R1R14R2
001211122A1=140010001

R1R1×1
001211122A1=140010001

C1C3
100112221A1=041010100

R2R2R1
100012221A1=041031100

R3R32R1
100012021A1=041031182

C3C32C2
100010023A1=0490371818

R3R32R2
100010003A1=049037124

R3R3×13
100010001A1=⎢ ⎢ ⎢049037132343⎥ ⎥ ⎥

A1=⎢ ⎢ ⎢049037132343⎥ ⎥ ⎥

xyz=⎢ ⎢ ⎢049037132343⎥ ⎥ ⎥1957

xyz=⎢ ⎢ ⎢206315+4919+10283⎥ ⎥ ⎥

xyz=⎢ ⎢ ⎢4334373⎥ ⎥ ⎥

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