# How do you write an equation for the nth term of geometric sequence -6561, 1458, -324?

##### 1 Answer

#### Explanation:

The general structure of a geometric sequence is:

So lets just look at the numbers for the moment

From the above it is quite evident that you can find

So we have

Ignoring the signs to start with. We can allow for that later.

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Test: The next number should be of magnitude 324

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Consider the alternating positive negative

If we use

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