Question

consider the A.S -3,-7,-11
write the algebra of this A.S
find the sum of n terms​

Answer 1

Answer:

Explanation:

The way to get any equation off an arithmetic sequence is using this:

t ( n ) = a + ( n − 1 ) ( d )

d = the difference between two terms

n = term number

a = 1st term

As we can see from the sequence:

a = -26

d = 11

Substitute:

→ t ( n ) = −26 + ( n − 1 ) ( 11 )

→ t ( n ) = 11 n − 37

P.S.

I'm not sure whether you want this type of nth term equation or the recursive one