Fun Math Finding
For some reason, as Alison was reading TIME in bed last night, I thought about multiplication. I multiplied 10 x 10 and got 100. Then I multiplied 9 x 11 and got 99.
Hmmm...does that work for every number?
3 * 3 = 9; 2 * 4 = 8.
38 * 38 = 1444; 37 * 39 = 1443.
0 * 0 = 0; -1 * 1 = -1.
-1 * -1 = 1; -2 * 0 = 0.
Sweet! (Well, I think so)
This means that:
x*x = ( (x+1)*(x-1) ) + 1
In other words: If you take a number and multiply it by itself, it will always be one more than the number minus one times the number plus 1.
Posts
Ouch...my brain hurts! Stop it!
ReplyDeleteI thought you were supposed to count sheep in bed not think about things like x*x = ( (x+1)*(x-1) ) + 1.
You are funny.
ReplyDeleteWow... this is why I had to take every math class twice in High School. Thank god it was not the same way in college.
ReplyDeletea fellow math nerd!!!!!
ReplyDeletefinally.
Thanks Callie :)
ReplyDeleteoh.
ReplyDeleteYou are a nerd. And I'm pretty sure that's an established math formula. Ask Kim, she's a math nerd, too.
ReplyDeleteI got mom's genes. I would not have figured that out even ever. Way to go mathmatic Geist!
ReplyDelete