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

1. dpflan Group Title

I think I can handle this ;)

2. dpflan Group Title

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

3. amistre64 Group Title

the suspense is killing me :)

4. dpflan Group Title

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

5. amistre64 Group Title

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

6. sleestak Group Title

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

7. dpflan Group Title

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

8. amistre64 Group Title

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

9. dpflan Group Title

with the candlestick?

10. dpflan Group Title

@sleestak No problem, glad I could help!

11. amistre64 Group Title

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

12. dpflan Group Title

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

13. sleestak Group Title

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

14. sleestak Group Title

9

15. sleestak Group Title

oh no. sorry one sec

16. sleestak Group Title

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

17. dpflan Group Title

x1 -> 1 x2 -> 4 x3 -> 9 SUM = 14, yeah, you're now an expert it seems

18. sleestak Group Title

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

19. dpflan Group Title
20. dpflan Group Title

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

21. dpflan Group Title

Math is the most active subject

22. sleestak Group Title

oh. excellent.

23. dpflan Group Title

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.

24. sleestak Group Title

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

25. dpflan Group Title

26. dpflan Group Title

*got

27. sleestak Group Title

oh okay. let me post

28. sleestak Group Title

should I now 'close' this question?

29. dpflan Group Title

Yep