# How do you use sigma notation to write the sum for #3-9+27-81+243-729#?

In order to use summation notation, we need to find something that increments by 1 with each new term.

and so on.

What we notice is that the powers of -3 are going up by 1 with each new term. This is the increment value we will use in our sigma notation.

Our sum can be thought of as:

Which is written in sigma notation as:

There are other ways to write the sum; they are included as extras in the Answer portion.

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The sum can be represented using sigma notation as follows:

∑((-3)^n), where n starts from 0 and ends at 5.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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