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question on picture : a. x - 5 5 0 A = -1 x - 2 2 4 x - 8 3. Determine the value

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question on picture :

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a. x - 5 5 0 A = -1 x - 2 2 4 x - 8 3. Determine the value of x that satisfies det(A)) = -1. Then find the inverse of the matrix A b. Find the perimeter and area of the triangle formed by the two vectors u = -i + j + 3k and v= -21 + 3j - 2k

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