Linear Algebra: Basis Homework Help

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phyxius117
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Homework Statement


Problem21.jpg


Homework Equations





The Attempt at a Solution



I don't know how to do this problem.. Help please!
 
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Here, maybe this will help you understand projections onto a subspace:
http://www.cliffsnotes.com/study_guide/Projection-onto-a-Subspace.topicArticleId-20807,articleId-20792.html

Do you understand the concept of orthogonality?
 
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