Well the x and y have number values and I just wanted the method so I could do it myself but here are the numbers:
for x1 = 2, x2 = -3, x3 = 10 x4 = -5, x5 = -3
for y1 = -1, y2 = 3, y3 = 5, y4 = 7, y5 = -2.
i is supposed to represent for example 1 in x1, 2 in x2 etc. Its a little i.
Alright, so when I asked you previously if I had typed up the problem correctly, and you said "yes," that wasn't true, evidently. And you are now providing, in addition, a hugely crucial portion of the problem that you also neglected to mention.
So now I ask you again. Think very hard. Is this the problem:
?
Ah, no, I'm afraid not, for at least 3 reasons. First, I have done the arithmetic myself based on the numbers you provided, and reached a different solution. Second, your answer is a negative number, and since the expression at hand involves the sum of four squares, a negative answer is impossible. Thirdly, you have provided a question involving a finite sum with 4 terms, and supplied data for 5 terms, so something is bound to be wrong with just about any answer you come up with.