Question: question10 (a) ([3 points]) Show that U is a subspace of R4 . Find a basis and give the dimension of U. (b) ([3 points])

question10 (a) ([3 points]) Show that U is a subspace of R4 . Find a basis and give the dimension of U. (b) ([3 points]) Use the Gram-Schmidt procedure to find an orthogonal basis of U. (c) ([2 points]) Let ~y = (0; 1; 0; 0) 2 R4 . Give the best approximation of ~y by a vector of

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