Question: [10 points] Let A be a (possibly rectangular) matrix. Show that ATAx = b has a solution if and only if blNull(A). [Note: we discussed

[10 points] Let A be a (possibly rectangular) matrix. Show that ATAx = b has a solution if and only if blNull(A). [Note: we discussed this in class on 10/20. I'm assigning it as a problem to be sure you got it.]

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