Q. 194.5( 2 Votes )

Prove the followi

Answer :

Let Δ =


Applying C1 C1 + C2 + C3, we get


Δ =


Taking out common from C1, we get


Δ =


Applying R2 R2 – R1 and R3 R3 – R1, we get


Δ =


Expanding along C1, we get


Δ = 2(a+b+c)[1.{(a+b+c)2-0}]


Δ = 2(a+b+c)3 = RHS


Hence proved.


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