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Let A = (1 -2

-1 2

0 3

2 5)

and b = ( 3

1

-4

2)

(a) Find a least-squares solution of Ax = b.

(b) Find the orthogonal projection of b onto the column space of A.

(c) Compute the least-squares error ( in the solution of part ( a )).

Thank you!

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# Least-squares solution

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