Expanded Form of Sigma Notation Problem

[phillyolly]

Write the sum in expanded form.

I don't know where to start with...

 

[berkeman]

Write the sum in expanded form.

I don't know where to start with...

Is expanded form just writing it out?

 

[phillyolly]

Previous ones, I solved them by expansion and getting a number as an answer.
This one, I think maybe just expansion?...

 

[berkeman]

Can you post an example of a previous one where you were able to solve for a numerical answer? And is there any more information about this problem? Any definition of f(x), or delta-x?

 

[phillyolly]

The first two are the ones I solved.

The book has no more information, just this one.

 

[berkeman]

The first two are the ones I solved.

The book has no more information, just this one.

Hmm. Maybe others can see something we're missing, but I'd just write it out as a sum, showing the first few terms, then some ellipses, then the nth term. Do you submit the answer to an automated checking probram online, or send it to a human for checking? If it's an automated checker, you'd need to figure out how many terms before the ellipses it expects...

 

[phillyolly]

Hmm. Maybe others can see something we're missing, but I'd just write it out as a sum, showing the first few terms, then some ellipses, then the nth term. Do you submit the answer to an automated checking probram online, or send it to a human for checking? If it's an automated checker, you'd need to figure out how many terms before the ellipses it expects...

My instructor will check the answer...I don't think I should use ellipses in the answer. Just expansion. I have no idea what to start with.

 

[Mark44]

Write the sum in expanded form.

I don't know where to start with...

This means to write the terms in the sum: f(x₁)\Delta x_1 + f(x₂)\Delta x_2 + and so on. Since n is not given, the usual practice is to write a few terms, then + ... + <last term>.

 

[Mark44]

My instructor will check the answer...I don't think I should use ellipses in the answer. Just expansion. I have no idea what to start with.

Since you don't know n, you have to use an ellipsis in your answer.

 

[phillyolly]

This means to write the terms in the sum: f(x₁)\Delta x_1 + f(x₂)\Delta x_2 + and so on. Since n is not given, the usual practice is to write a few terms, then + ... + <last term>.

Oh, I see now, thank you all a lot. You are right, I will use ellipsis.