- #1

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## Homework Statement

In this pattern, what is the algebraic expression for the term

*t*?

-15, 30, 90, -360

## Homework Equations

t= term number

## The Attempt at a Solution

no idea

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- Thread starter Natko
- Start date

- #1

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In this pattern, what is the algebraic expression for the term

-15, 30, 90, -360

t= term number

no idea

- #2

- 252

- 1

What do you multiply each term by to get the next?

- #3

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That's what I want to find out. It does not necessarily have to be multiplication only.What do you multiply each term by to get the next?

In words it would be:

current term value = the previous term's value multiplied by the current term number, and change poles if the current term number is even; the first term value is -15.

- #4

HallsofIvy

Science Advisor

Homework Helper

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Well, I notice that 30= 2*15, 90= 3*30, and 360= 4*90. That is, [itex]a_n= n*a_{n-1}[/itex]. Also, the signs are -, +, +, -. You should be able to find a power of -1, in terms of n, that will give that.

- #5

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Well, I notice that 30= 2*15, 90= 3*30, and 360= 4*90. That is, [itex]a_n= n*a_{n-1}[/itex]. Also, the signs are -, +, +, -. You should be able to find a power of -1, in terms of n, that will give that.

So what would the algebraic expression to find the

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