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# MATRIX ANALYSIS FOR SCIENTIST AND ENGINEERS by Alan Laub This is for chapter 4, question 4. Can somebody help explain to me this proof?

**MATRIX ANALYSIS FOR SCIENTIST AND ENGINEERS by Alan Laub**

This is for chapter 4, question 4. Can somebody help explain to me this proof? See image for the question as I am not able to properly type the question out. This chapter is about the Moore-Penrose Pseudoinverse.