Please show your attempts at all of them, including the four you think you know. We need to see how you see them differently.How to write these in SUM form
I know the first four but how to write the last four
Please show your attempts at all of them, including the four you think you know. We need to see how you see them differently.
I will point out that where you wrote [math]a\sum_{i=1}^n x_i[/math] I would write [math]\sum_{i=1}^n ax_i[/math] so that it says exactly what the given sum does, with no modifications.
Please make your images right side up and big enough to read
These are almost the same as the one I showed:Actually i can't try with last three ones
About your way it's also right yeah it's same
These are almost the same as the one I showed:
In the first, the only new thing is that the coefficients [imath]a[/imath] have been subscripted, [imath]a_i[/imath]. Just insert that in what I wrote.
In the second, the coefficients are back to being constants, but there is a fraction. What will the ith term be?
As for
again, what is the ith term? You just replace n with i. Put that after the sigma, and you have it.
I get the impression you think something about this is far more complicated than it actually is! Please do try; probably if you try at all, you will be right, or nearly so.
Continuing ...
is correct.
Not quite. You've used the last (nth) coefficient for every term. What is the coefficient of the ith term?
That's correct. You can check by replacing i with 1, 2, 3, ... and confirming that you get the terms they showed.
And this is something you should always do! In fact, you can think of the work you are doing as asking yourself, "What can I write in the summation that will result in each of these terms?"
Yes. When [imath]i=1[/imath], the term is [imath]\frac{1}{2}x_1[/imath]; when [imath]i=2[/imath], the term is [imath]\frac{2}{3}x_2[/imath]; and so on.Oh yeah i got it now thank you for helping me
So it's correct now?