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Bookmark Show all steps: Chapter 7.1, Problem 13E 12-1 Chapter 7.1A 10E Comment 11E 12E Step 17 of 19 13E 14E Let a be the ge

I cannot understand about this section

||AX||2=||A||2||X||2

please explain why

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l A I 2. 80 ch 8o Talen GR) 1 Arl

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