nth term in algebra?
One term of an arithmetic sequence is 𝑎9 = 25. The common difference is d = 4. Write a rule for the nth term.
One term of an arithmetic sequence is 𝑎9 = 25. The common difference is d = 4. Write a rule for the nth term.
lenpol7
#9 ; 4() + c = 25
#9 : 36 + c = 25
c = -11
Hence nth term is 4n - 11
?
Write a rule for the nth term.
One term of an arithmetic sequence is a9 = 25.
The common difference is d = 4.
-7, -3, 1, 5, ...
a_n = 4 n - 11
stanschim
a9 = 25
a8 = 21
a7 = 17
a6 = 13
a5 = 9
a4 = 5
a3 = 1
a2 = -3
a1 = -7
an = -7 + (n-1)4
an = -7 + 4n - 4
an = -11 + 4n