題組內容

5 Let $A = \left[ \begin{array}{cccc} 1 & 0 & 1 & 1 \\ 1 & 1 & 0 & 1 \end{array} \right]^\top \in M_{4 \times 2}(\mathbb{R})$ and $b = [1, 1, 0, 0]^\top \in \mathbb{R}^4$.

b. (10) Find \( x0 \in \mathbb{R}^2 \) such that \( \|Ax0 - b\|2 = \min{x \in \mathbb{R}^2} \|Ax - b\|_2 \).