Question: (Linear Algebra) If v is a nonzero vector in R3 and b is a real number, we can consider the plane P = {x :
(Linear Algebra)
If v is a nonzero vector in R3 and b is a real number, we can consider the plane
P = {x : x v = b}.
(a) Let x be the unique point on the line through the origin parallel to v that's also
in P. It has the form x =tv; what is t?
(b) Show that for any x P, x x is perpendicular to v.
(c) Use Pythagoras' theorem to show that x is the point in P that's closest to the origin.
(d) Using the above, what point in the plane x1 2*x2 + x3 = 6 is closest to the origin?
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