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Femme_physics
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Homework Statement
http://img833.imageshack.us/img833/681/a1a2.jpg
Calculate which number you have to add to a1, a2 and a3 in order to get 3 subsequent numbers in a geometric series
The Attempt at a Solution
Getting a2 and a3 was easy.
Plugging in the values I need for n, I get
a2 = 5
a3 = 13
Okay, now by trial and error I figured out that if I add 3 to all the values, I get 3 numbers that the multiplicative value of 2 is their difference. But, how do I get to that fact without a guessing game of trial and error, I don't know. Can anyone help me?
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