Q. 34.2( 85 Votes )

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Answer :

|A| =

We know that determinant of A is calculated as


= 1(2) - 2(4)


= 2 - 8


|A| = -6


LHS: |2A|




= 2(4) - 4(8)


= 8 - 32 = -24


|2A| = -24 …LHS


RHS: 4|A|


4|A|= 4(-6)


= -24


4|A| = -24 …RHS


LHS = RHS


Hence proved.


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