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15.07.2019 •
Mathematics
What are the explicit equation and domain for a geometric sequence with a first term of 5 and a second term of −10?
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Ответ:
The standard form of a geometric sequence is . We are told that the first number in the sequence is 5 and the second number is -10. Geometric sequences rely on that r to be a common ratio which is a muliplier. So to get from 5 to -10 we have to multiply by -2. That means that r = -2. Our formula then is and any value could be subbed in for n to find that specific number in the sequence. A geometric sequence may be thought of as an exponential function whose domain is the set of natural numbers.
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