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I consider this question to be a good example of an admissible homework question. The OP states the problem clearly enough, it presents his solution, then states what's troubling him with the solution ...

"The intention of the poster is to improve his understanding of how the problem is solved" It does not appear as such. The OP states the problem, then the answer and then asks "How did we arrive ...

This is unclear, and unnecessarily gendered. The user must demonstrate his homework question and effort using text, markdown syntax and/or images space provided in the text of his question ...

Only if it follows the usual rules: the asker must have made some attempt to answer it themselves, they must show us what they've done, and they must explain which concept or aspect of it they're ...

I posted a comment first, asking if the OP had tried to understand the answer on his own. If he had, he would hopefully be more specific about where he got stuck. But more than 12 hours went by with ...