Question: If I solve a least squares problem with 2 unknowns, and (Q^T)b = [1 2 3 4]^T, then what is the 2-norm of my residual?

If I solve a least squares problem with 2 unknowns, and (Q^T)b = [1 2 3 4]^T, then what is the 2-norm of my residual?

I believe the formula for that is the 2-norm||cR(11)x(1)R(12)x(2)||^2

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