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We have an upcoming exam and the question I have attached was from last years exam. But I am really stuck on how to get started with it. I would really appreciate some help with it.Exam Question

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Start with $$ \|\delta x\|=\|A^{-1}Aδx\|\le\|A^{-1}\|·\|Aδx\| $$ and insert the equation, guided by the expected result.

Lutz Lehmann
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