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

27

Step-by-step explanation:

129 - (-1) = 130

130/5 = 26

26+1 = 27

n = 27

Step-by-step 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