Consider the vectors R³, and let W be the subspace span{1, 2}. a) Find an orthogonal basis for W. 3 o) Find the orthogonal projection of 7 = 1 onto W. 10 5 = --8-8
Consider the vectors R³, and let W be the subspace span{1, 2}. a) Find an orthogonal basis for W. 3 o) Find the orthogonal projection of 7 = 1 onto W. 10 5 = --8-8
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:Consider the vectors
in R³, and let W be the subspace span{₁, 2}.
(a) Find an orthogonal basis for W.
3
(b) Find the orthogonal projection of y = 1 onto W.
10
(c) Find the distance from y to (the closest point in) W.
2
5
*-8--8
=
=
![For part (a), note first that the vectors 7₁ and 2 are linearly independent: there are two of them and
neither is a scalar multiple of the other. Gram-Schmidt then produces the orthogonal basis {₁, 2} =
2
{GB]}
For part (b), the orthogonal projection formula gives
3
y-v₂
projwy =
-U₁ +
-9/2
V₁ V1
02 - 02
9/2
Finally, for part (c), the distance is || - projwy|| = || |11/2| || = ¹12
11/2
-√₂
=](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ffa923b6f-81dd-482c-8885-6de6bc295751%2Fc79af9db-9561-445e-85cc-4291580f0db8%2Flonvhbi_processed.jpeg&w=3840&q=75)
Transcribed Image Text:For part (a), note first that the vectors 7₁ and 2 are linearly independent: there are two of them and
neither is a scalar multiple of the other. Gram-Schmidt then produces the orthogonal basis {₁, 2} =
2
{GB]}
For part (b), the orthogonal projection formula gives
3
y-v₂
projwy =
-U₁ +
-9/2
V₁ V1
02 - 02
9/2
Finally, for part (c), the distance is || - projwy|| = || |11/2| || = ¹12
11/2
-√₂
=
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