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Linear Algebra - Four Fundamental Subspaces & Orthogonal Complement

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Give a basis for the orthogonal complement of each of the following subspaces of R^4.

a. V = Span ((1, 0, 3, 4), (0, 1, 2, -5))
b. W = {x E R^4 : x_1 + 3x_3 + 4x_4 = 0, x_2 + 2x_3 - 5x_4 = 0}

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