geometric sequence shown?

Algebra
Tutor: None Selected Time limit: 1 Day

which exponential function models the geometric sequence shown below 

2,4,8,16,32 

May 12th, 2015

A geometric sequence is a sequence where each term is found by multiplying or dividing the same value from one term to the next. We call this value "common ratio"

Looking at 2, 4, 8, 16, 32 ....... carefully helps us to make the following observation:

Geometric sequence:2, 4,8

to get the common ratio we multiply  each term by 2 to get the next term

y=a.b^x

where a is  a constant  and b is 2 which is the constant ratio

a=1/2

y=(1/2).2^x .........this is the expotential function

May 12th, 2015

so by doing that would i get 2*2^x-1

May 12th, 2015

so by doing that would i get 2*2^x-1

May 12th, 2015

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May 12th, 2015
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