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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
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?
So what would the algebraic expression to find the n^{th} term be?Are you saying that you have a sequence, [itex]a_1= -15[/itex], [itex]a_2= 30[/itex], [itex]a_3= 90[/itex], and [itex]a_4= -360[/itex]?
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.