How to use row elementary row transformation to find invertible matrix, and is there any formula to find the nth power of matrix?

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• 2. On covariance and covariance matrix formula It is well known that the covariance (x1-e) is not one of the covariance (x1-1)
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• 4. Let a = (α, γ 2, γ 3) and B = (β, γ 2, γ 3), where α, β, γ 2 and γ 3 are all ternary matrices Let a = (α, γ 2, γ 3) and B = (β, γ 2, γ 3), where α, β, γ 2 and γ 3 are all ternary matrix, and | a | = 2 and | B | = 1 / 2 are known, then | a + B is obtained|
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