*> (besides positive)* You can chart a and b on a 2D coordinate system, where th... | Hacker News

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		phoe-krk on Dec 15, 2024 \| parent \| context \| favorite \| on: A visual proof that a^2 – b^2 = (a + b)(a – b) > (besides positive) You can chart a and b on a 2D coordinate system, where they're allowed to be negative. Even positivity is not strictly required here.

wrsh07 on Dec 15, 2024 [–]

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

phoe-krk on Dec 15, 2024 | [–]

Check the quadrant which the result ends up in.

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