I'm not sure I quite understand what the visual proof looks like if they're nega... | Hacker News

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wrsh07 23 days ago | parent | context | favorite | on: A visual proof that a^2 – b^2 = (a + b)(a – b)

I'm not sure I quite understand what the visual proof looks like if they're negative

phoe-krk 23 days ago [–]

Check the quadrant which the result ends up in.

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