Question

Find an explicit rule for the nth term of the sequence.

7, -7, 7, -7,

Answer 1

@amistre64 @thomaster @UnkleRhaukus

Answer 2

what formula for n will make odd terms positive,
and even terms negative?

1, -1, 1, -1, ...

Answer 3

-1,-1

Answer 4

(-1)^?

Answer 5

(-1)^2

Answer 6

it needs to be a function of n

Answer 7

an = 7 • (-1)n

Answer 8

(-1)^n i ment it to say

Answer 9

n = 1, 2 , 3, 4, ...
a(n) = 7, -7, 7, -7, ...

Answer 10

an = 7 • 1^n - 1

Answer 11

n = 1, 2, 3, ...
(-1)^n = (-1)^1, (-1)^2, (-1)^3 ...
= -1, 1, -1, ...

Answer 12

so would it be an = 7 • (-1)^n - 1

Answer 13

n = 1, 2, 3, ...
a_n= 7 • (-1)^(n-1) = 7 • (-1)^(1-1), 7 • (-1)^(2-1), 7 • (-1)^(3-1) ....
= 7, -7 , 7 ....

Answer 14

so...an = 7 • 1^n + 1

Answer 15

my bad scratch that last post

Answer 16

tnhx though you was very helpful