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vlabodo [156]
3 years ago
7

What is the equation for a geometric sequence with a first term of 4 and a second term of −8?

Mathematics
1 answer:
mihalych1998 [28]3 years ago
5 0
<h3>Answer:</h3>

a_n=4(-2)^{n-1}

<h3>Step-by-step explanation:</h3>

The common ratio is -8/4 = -2. The general formula for the n-th term is ...

... an = a1·r^(n-1) . . . . . . note the use of the caret (^) and parentheses

For r = -2 and a1 = 4, this becomes ...

... an = 4·(-2)^(n-1) . . . . approximately matches the 2nd selection

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