00:01
Okay, so let's start by noticing that we have a difference inside of our summation.
00:05
So let's break this up into two summations.
00:11
So our first one is this our constant four, and then we have minus the summation of i is equal to 1 to 40 of i squared.
00:20
So looking at theorem 2 .1, this is equation 1, and this is equation 3.
00:30
Okay? so we can rewrite this as our constant, which is 4 times our last term, that's 40 and then we have plus, or actually that's minus, that's a minus sign.
00:45
We have our last term, that's 40 times our last term plus 1, so 41, and then times two times our last term plus 1 divided by 6...