# Summation Question

write out the following sum and compute where possible

$$\sum 3$$ x =0 (x2 + 2x + 2)

is that clear???

Related Precalculus Mathematics Homework Help News on Phys.org
malawi_glenn
Homework Helper
do you mean

$$\sum _{n = .3}(x^2+2x+2) = ?$$

when $$x=0$$

??

Now where is the index $n$ in the expression to be summed over?

And where is your attempt to solution?

CompuChip
Homework Helper
Malawi that doesn't make much sense either.
Missusa, if you can't write proper LaTeX, it's better to do it completely without. For example, write
"Sum from n = 1 to infinity of (e^(-n / 3) / n^2)"

Integral
Staff Emeritus
Gold Member
Maybe OP means:

$$\sum^3 _{x= 0}(x^2+2x+2)$$

HallsofIvy
Homework Helper
write out the following sum and compute where possible

$$\sum 3$$ x =0 (x2 + 2x + 2)

is that clear???
Maybe OP means:

$$\sum^3 _{x= 0}(x^2+2x+2)$$
Is Integral right about what you mean? Then the sum, from x= 0 to 3 means you replace the "x" in x2+ 2x+ 2 by 0, then by 1, then by 2, then by 3, and add:
(02+ 3(0)+ 2)+ (12+ 2(1)+ 2)+ (22+ 2(2)+ 2)+ (32+ 2(3)+ 2)

Astronuc
Staff Emeritus
Maybe OP means:

$$\sum^3 _{x= 0}(x^2+2x+2)$$
That's about the only way I see it making sense. Same as if the limits of summation were n = 0, 3 and x = n, an integer.

Thank you so much you two are very smart...I do appreciate your help. That is what I meant but I could not write it the way it was.

Thanks again,

Can I get some information about Endogenous Moeny: honrizontalism and structuralism??

Dick
Homework Helper
Can I get some information about Endogenous Moeny: honrizontalism and structuralism??
Definitely not. Especially if you are talking about Levi-Strauss anthropological structuralism with gratuitous misspellings.

Astronuc
Staff Emeritus
Can I get some information about Endogenous Moeny: honrizontalism and structuralism??
That would be better suited in another thread, either in other sciences or in the economic forums.

Ostensibly, such a disussion is found in one's macroeconomic textbook, or one can search on Google with the keywords. Nevertheless -

http://www.trincoll.edu/~setterfi/Horizontalism,%20Structuralism%20and%20Historical%20Time.pdf [Broken]

Complexity, Endogenous Money and Macroeconomic Theory By Mark Setterfield

http://cas.umkc.edu/econ/economics/faculty/Fontana/Winter 2005/ROPE.pdf

Last edited by a moderator:
Thank You!