R³ given by 3x₁ + 4x2x3 7x1 ·x2 + x3 5x1 + 6x2 - X3 and then calculate T(-7, 1, 9) by directly substituting in the equations and also by matrix multiplication. Find the standard matrix for the linear operator T: R³ W₁ = W₂ = W3 = i i i T(-7,1, 9) = ( i i i i i i i [T] = i

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A:

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A: