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A=(1,2),(3,4) Ans A(Adj A)=Ki, Then the Value of 'K' is - Mathematics and Statistics

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MCQ

`A=[[1,2],[3,4]]` ans A(Adj A)=KI, then the value of 'K' is

Options

  • 2

  • - 2

  • 10

  • -10

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Solution

A( Adj A) =|A| . I

`therefore K=|A|`

`therefore |A|=|[1,2],[3,4]|=-2`

Concept: Determinants - Adjoint Method
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