Question

-4n + 5 is the algebraic form of an arithmetic sequence. What is its first term and common difference?

Answer 1

1 and -4.

Explanation:

First term is when n = 1 so it is:

-4(1) + 5 = 1.

The common difference is the coefficient of n which is -4.

For example the 2nd term = -4(2) + 5 = -3.

Common difference = 2nd term - first term

= -3 -1

= -4.

Answer 2

a1=1

- 4 (common difference)

Explanation:

a1=-4*1+5=-4+5

a1=1

a2=-4*2+5=-8+5=-3

common difference=a2-a1=-3-1=-4