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Question

By using properties of determinants, show that:

(i)

(ii)

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Solution

(i)

Applying R1 → R1 + R2 + R3, we have:

Applying C2 → C2 − C1, C3 → C3 − C1, we have:

Expanding along C3, we have:

Hence, the given result is proved.

(ii)

Applying R1 → R1 + R2 + R3, we have:

Applying C2 → C2 − C1 and C3 → C3 − C1, we have:

Expanding along C3, we have:

Hence, the given result is proved.


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