memester74
18.07.2019 •
Mathematics
What is the formula for the following arithmetic sequence? -9, -2, 5, 12,
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Ответ:
Formula
an = a1 + (n - 1)*7 We have to try it.
Givens
a4 = ??
a1 = - 9
n = 4
d = 7
Sub and solve
a4 = - 9 + (4 - 1)*7
a4 = - 9 + 3*7
a4 = - 9 + 21
a4 = 12 which seems to check.
Answer an = a1 + (n - 1)*d
Ответ: