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The inverse of the matrix {bmatrix} 4 & 7 1 & 2 {bmatrix} is-

Question

The inverse of the matrix $[4172]$ is-

[2 - 1 74]

[2 - 7 - 1 4]

[- 2 - 4 7 - 1]

none of these

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The inverse of the matrix

[4172]

is-

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Text solutionVerified

Let

A = [4172]

a d j A = [2 - 7 - 1 4]

∣ A ∣ = 1

∴ A^{- 1} = \frac{a d j A}{∣ A ∣} = [2 - 7 - 1 4]

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