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प्रश्न
Given that A-1= `1/7 [(2,1),(-3,2)]`, matrix A is ______.
पर्याय
`7 [(2,-1),(3,2)]`
`[(2,-1),(3,2)]`
`1/7 [(2,-1),(3,2)]`
`1/49 [(2,-1),(3,2)]`
MCQ
रिकाम्या जागा भरा
उत्तर
Given that A-1= `1/7 [(2,1),(-3,2)]`, matrix A is `underlinebb([(2,-1),(3,2)])`.
Explanation:
We know that
(A-1)-1 = A
A-1 `=[(2/7,1/7),(-3/7,2/7)]`
A = `(adj (A^-1))/|A^-1|`
A = `[(2,-1),(3,2)]`
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