Post AscpDLsVBWzu1ncRM0 by demofox@mastodon.gamedev.place
 (DIR) More posts by demofox@mastodon.gamedev.place
 (DIR) Post #AscpDEGJV7I6PKhLMG by demofox@mastodon.gamedev.place
       2025-03-31T04:39:52Z
       
       1 likes, 2 repeats
       
       My 10yo son said he noticed something odd about multiplication.If you have some number C, then (C+1)*(C-1) is 1 less than C*C.We started exploring and it worked with any C we tried.We tried +/-2 and it was 4 less. He said he thought it was going by the square.So we tried +/-3 and yep, it was 9 less.C doesn't have to be an integer either.It was a cool pattern he noticed and it was fun getting to explore math with him.He surprised me a bit with that kind of an insight.
       
 (DIR) Post #AscpDLsVBWzu1ncRM0 by demofox@mastodon.gamedev.place
       2025-03-31T04:44:33Z
       
       1 likes, 0 repeats
       
       Now that I write it out it's more obvious. You can just FOIL :P(C+N)(C-N) = C^2 - N^2