Lost with Geometric Sequence
Can someone please explain to me how to do geometric sequence when ur starting with something like:
a sub 2 = 40 and a sub 4 = 160
How do u set it up if you don't have a sub 0?
a sub 2 = 40 and a sub 4 = 160
How do u set it up if you don't have a sub 0?
posted by brianhorwich at 9:19 PM
1 Comments:
Teh first step taht you would do is to find the rate of change/teh constant ratio. If asub2=40 and asub4=160, asub4=160=asub2*(x^2). x would be the ratio and that ratio would be rasied to the second power because there two terms from asub2 to asub4. Solving the equation, x (constant ratio) would be 2. After finding the ratio, you would set up another equation to find the initial term. asub0=10.
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