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If matrix A=[(1,2),(4,3)], such that AX=...

If matrix `A=[(1,2),(4,3)]`, such that `AX=l`, then `X` is equal to

A

`(1)/(5)]{:(,1,3),(,2,-1):}]`

B

`(1)/(5)[(,4,2),(,4,-1):}]`

C

`(1)/(5)[{:(,-3,2),(,4,-1):}]`

D

`(1)/(5)[{:(,-1,2),(,-1,4):}]`

Text Solution

Verified by Experts

The correct Answer is:
C

Given `A=[{:(,1,2),(,4,3):}]`
and AX=I
`Rightarrow X=A^(-1)l`
`Rightarrow X=A^(-1)`
Now, `A^(-1) =(1)/(|A|) [{:(,3,-2),(,-4,1):}]`
`=(1)/(3-8) [{:(,3,-2),(,-4,1):}]`
`=(1)/(-5) [{:(,3,-2),(,-4,1):}]`
`=(1)/(5)[{:(,-3,2),(,4,-1):}]`
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