Question

Write down in terms of n, an expression for the nth term

Answer 1

Answer:

Using formula for both

=> $a_{n} = a_{1} +d(n-1)$

A) a1 = 4, d = 3

=> 4+3(n-1)

=> 4+3n-3

=> 3n+1

B) a1 = -7, d = 5

=> -7+5(n-1)

=> -7+5n-5

=> 5n-12

Answer 2

Answer:

-3n + 7

-5n - 2

Step-by-step explanation:

The a is the first term, and d is the difference.

d = -3

a = 4

an = dn + (a - d)

an = -3n + (4 - (-3))

an = -3n + 7

d = -5

a = -7

an = dn + (a - d)

an = -5n + (-7- (- 5)

an = -5n + -2