The nth term of an AP is a_n = 4n + k, and its 9th term is 30. Find its first term.

Question

Accepted Answer

-2. a_9 = 36 + k = 30 gives k = -6, so a_n = 4n - 6 and a_1 = 4 - 6 = -2. The value -6 is k itself, not the first term; 2 flips the sign of k; 4 is the common difference.

The nth term of an AP is $a_{n} = 4 n + k$ , and its 9th term is 30. Find its first term.

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More Class 10 nth Term of an AP practice

The nth term of an AP is an​=4n+k, and its 9th term is 30. Find its first term.

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 nth Term of an AP practice

The nth term of an AP is $a_{n} = 4 n + k$ , and its 9th term is 30. Find its first term.