kinda fucked that 5 * 5 !== 6 * 4
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it's nice tho. 6 * 4 = (5 + 1) * (5 - 1) = 5^2 - 1^2, the difference is cleanly understandable
Fine
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(n + 1) * (n - 1) = n^2 - 1, for all n
8 * 6 = 48 = (7 * 7) - 1
11 * 9 = 99 = (10 * 10) - 1
17 * 15 = 255 = (16 * 16) - 1
2001 * 1999 = 3999999 = (2000 * 2000) - 1
Kinda neat
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this is v cool. also, makes a lot of sense lmao when you remember anything about quadratic equations from childhood (which i do not really)
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