Question

Given the following,
x1=2 x2=-1 x3=-2 x4=5 x5=-4 x6=8
Find:
3
∑ ( x subi - 1 ) 2
i=1

Answer 1

I think I can handle this ;)

Answer 2

\[\sum_{i=1}^{i=3} (x_i - 1) ^2 \]

Answer 3

the suspense is killing me :)

Answer 4

You given 6 x_i values. The equation only wants you to consider x_i for (i=1 until i=3), that would be x1, x2, x3. The sigma is the symbol for sum. So the problem is to find the sum for the following events: plugging in each x_i subtracting 1 then squaring that. Hence you'll have 3 values that you then add to together to get the final value.

\[ i=1, x_1 = 2, (2-1)^2 = 1\]
\[i=2, x_2 = -1, ((-1) -1)^2 = ... \]
... and so on

Answer 5

could we expand the binomial and pick it apart sum for sum?

Answer 6

OH! THANK YOU. DPFLAN, you are the best <3

Answer 7

@amistre64 for sure, that would create even more suspense!

Answer 8

the butler did it, im sure of it ....

Answer 9

with the candlestick?

Answer 10

@sleestak No problem, glad I could help!

Answer 11

yes, with the candlestick lol ... get a clue

Answer 12

@sleestak I imagine you may have some more problems that are similar to this that you need to work on, so good luck

Answer 13

thanks. I'll tell you what I come up with

Answer 14

9

Answer 15

oh no. sorry one sec

Answer 16

14. OK. I think I can do the other problem. THANKS :D

Answer 17

x1 -> 1
x2 -> 4
x3 -> 9

SUM = 14, yeah, you're now an expert it seems

Answer 18

you guys need to list finance as the next subject :D

Answer 19

http://openstudy.com/study#/groups/Finance

Answer 20

It actually had/has a pretty strong following/support from a professor at NYU - http://pages.stern.nyu.edu/~adamodar/

Answer 21

Math is the most active subject

Answer 22

oh. excellent.

Answer 23

So if your questions are mathematical, you'd probably be best served to ask them here because there is a greater mass of users in this group, so you're more likely get an answer.

Answer 24

yeah totally. this is awesome! I am going to use this all the time in school

Answer 25

awesome, tell your friends too! Also, I've the final question you asked about solved

Answer 26

*got

Answer 27

oh okay.
let me post

Answer 28

should I now 'close'
this question?

Answer 29

Yep