If the nth term of the sequence -1 , 4, 9, 14..... Is 129. Then find the value of n.

Question

asked Sep 20, 2021 139k views

2 Answers

Acuminate · Answer 1 · 2021-09-26T12:40:47+0000

Answer:

n = 27

Explanation:

This is Arithmetic sequence

a = -1

Common difference = 4 - (-1) = 4 +1 = 5

an = a + (n-1)d

129 = -1 + (n-1)*5

129 + 1 = (n-1)*5

130 = (n-1)*5

130/5 = n - 1

26 = n - 1

n = 26 + 1

n =27