Question: Let b = (3,1, 2, l)7. Find the closest point and the distance from b to the following subspaces: (a) The line in the direction

Let b = (3,1, 2, l)7. Find the closest point and the distance from b to the following subspaces:
(a) The line in the direction (1. 1. 1. I)T,
(b) The plane spanned by (1,1,0,0)T and (0.0, 1, l)T,
(c) The hyperplane spanned by (1,0,0,0)T, (0. 1.0. 0)T, (0, 0, l,0)T,
(d) The hyperplane defined by the equation
x + y + z + w = 0.

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