27 August, 21:34
Find the 77th term of the arithmetic sequence 14,3,-8, ...
27 August, 22:39
Let's make an equation (explicit of course)
3 - 14 = - 11
d = - 11
Now we are ready to make an equation!
f (n) = x first term + d (n-1)
f (n) = 14 - 11 (n-1)
Let's substitute 77 for n!
f (77) = 14 - 11 (77-1)
f (77) = 14 - 11 (76)
14 - 836 = - 822
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