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Cofactor

let a= aij is...

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let a= aij is 3 x 3 scalar matrix such that a11+ a22+ a33 = 15. Then write matrix A

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Q. If A = [a_ij] is a 3 × 3 scalar matrix such that a₁₁ = 2, then write the value of |A|.

A = [a_{i j}]

is a 3 × 3 diagonal matrix such that a₁₁ = 1, a₂₂ = 2 a₃₃ = 3, then find |A|.

A

3 \times 3

matrix such that

a_{11} = a_{33} = 2

and all the other

a_{i j} = 1

A^{- 1} = x A^{2} + y A + z I

, then the value of

(x + y + z)

I

is a unit matrix of order

3

A

3 \times 3

matrix such that

a_{11} = a_{33} = 2

and all the other

a_{i j} = 1

A^{- 1} = x A^{2} + y A - z I

, then find the value of

(x + y + z)

I

is a unit of matrix of order 3.

A = [a i j]

is a matrix of order 2x2 such that

| A | = 15

and cij represents the co factor of aij then find

a_{21} c_{21} + a_{22} c_{22}

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