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5 votes
Write an explicit formula for An, the nth term of the sequence 1, -2, 4, ....

2 Answers

3 votes

Answer:

(-2)^n-1

Explanation:

got it right on delta

User Pritish
by
4.0k points
2 votes

Answer:

an = (-2)^(n - 1)

Explanation:

a1 = 1

a2 = 1 * (-2) = -2

a3 = a2 * (-2) = (-2) * (-2) = (-2)^2

a4 = a3 * (-2) = (-2)^3

etc.

an = (-2)^(n - 1)

User Hitendra
by
3.7k points