victorian-hotel
Calculators
General
Algebra
Geometry
Coordinate-geometry
Statistics
Calculus
Qna
Math
victorian-hotel
victorian-hotel
Home
General
Algebra
Geometry
Coordinate-geometry
Statistics
Calculus
Qna
Math
MATH SOLVE
Home
General
Write the explicit formula for the arithmetic sequence. 2, -2, -6, -10, -14, ...A)an = 5 - 3nB)an =...
4 months ago
Q:
Write the explicit formula for the arithmetic sequence. 2, -2, -6, -10, -14, ...A)an = 5 - 3nB)an = 6 - 4nC)an = 8 - 6nD)an = 10 - 8n
Accepted Solution
A:
Given from the question
arithmetic sequence
a₁ = 2
a₂ = -2
a₃ = -6
and so on..
First, find the difference of the sequence
d = a₂ - a₁
d = -2 - 2
d = -4
Second, built the formula
General formula
an = a₁ + d(n - 1)
plug the numbers to the general formula
an = a₁ + d(n - 1)
an = 2 -4(n - 1)
an = 2 - 4n + 4
an = 2 + 4 - 4n
an = 6 - 4n
The answer is option B