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) (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 where n starts at
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