Question: Let hat ( x ) = ( A T A ) - 1 A T b be the least squares solution of A x =

Let hat(x)=(ATA)-1ATb be the least squares solution of Ax=b. Show that if Ax=b has a solution,
then it has hat(x) as a solution, i.e. Ahat(x)=b.
Let hat(x)=(ATA)-1ATb be the least squares solution of Ax=b. Show that

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