SOLUTION: What's the common ratio of -5, 20, -80 i tried this An=A1*(r)^n-1

Algebra.Com
Question 1070034: What's the common ratio of -5, 20, -80 i tried this An=A1*(r)^n-1


Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39618)   (Show Source): You can put this solution on YOUR website!
This means, what is the common ratio between every pair of successive terms in your sequence.


The two values for r should be equal.
Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

What's the common ratio of -5, 20, -80 i tried this An=A1*(r)^n-1
You can use this formula: .

However, it's much easier to use the formula that states that: , which results in:  =====> - 4 = - 4

Thus, the common ratio or  

RELATED QUESTIONS


find a1 and the common ratio(r). given an=1, n=7,... (answered by MathLover1)

The first term and common ratio of a geometric sequence is given below. What are the... (answered by ewatrrr,stanbon)

The sum of a finite geometric sequence for n terms with common ratio r and initial term... (answered by solver91311,ewatrrr,richard1234)

write the first six terms of the sequence

2. an=(n+1)^3
4. an=n/n+3

write the next  (answered by richard1234)

Hello, I am stuck with this problem and cannot seem to find any help.

I need to find... (answered by ewatrrr)

Use the formula for the general term (the nth term) of a geometric sequence to find the... (answered by MathLover1)

My problem is to find the indicated term for the geometric series described : 

Sn=33... (answered by Theo)

Sum of the first 6 terms of a geometric progression equals to 63. 
Sum of the even terms  (answered by Boreal)

A sequence is a function with domain the natural numbers 1,2,3,.... Using function... (answered by stanbon)