SOLUTION: What is the formula for the following arithmetic sequence? -2, 3, 8, 13, ..

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Question 634229: What is the formula for the following arithmetic sequence? -2, 3, 8, 13, ..
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
You're adding 5 each time. So d = 5

You're starting at -2, so a1 = -2

The formula is then

an = a1 + (n-1)*d

an = -2 + (n-1)*5

an = -2 + 5n-5

an = 5n - 7

So the formula is a%5Bn%5D=5n-7 where n starts at n=1

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