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## Homework Statement

I have a question about an old exam and i have no idea where to start. The question says:

Find the vector in the row space A=[1 0 1 1 /new row 0 1 -1 1] 2x4 matrix nearest to the vector (1,1,-1,1)

I have absolutely no clue how to start.

## Homework Equations

## The Attempt at a Solution

I have no clue how to start this...

my attempt was looking at it being confused for an hour