1.

If `A=[(x,1),(1,0)] and A=A^(-1)`, then x= . . . .

Answer» Correct Answer - A
We have, A=`[[x,1],[1,0]]`
`absA=("x"xx0-1)=-1`
adj A=`[[0,-1],[-1.x]]`
`A^(-1)=(adjA)/(absA)=(-1)[[0,-1],[-1,x]]=[[0,1],[1,-x]]`
Since, it is given, A=`A^(-1)`
`rArr[[x,1],[1,0]]=[[0,1],[1,-x]]`
`rArrx=0` {By equality of matrices}


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