High School

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Complete the recursive rule and the explicit rule for the arithmetic sequence: 84, 94, 104, 114, 124, ...

The recursive rule is:
\[ f(1) = 84, \, f(n) = f(n - 1) + 10 \, \text{for} \, n \geq 2. \]

The explicit rule is:
\[ f(n) = 84 + 10(n - 1). \]

Answer :

Given:

The arithmetic sequence is

84, 94, 104, 114, 124,....

To find:

The recursive rule and the explicit rule for the arithmetic sequence.

Solution:

We have, the arithmetic sequence

84, 94, 104, 114, 124,....

Here,

First term : a=84

Common difference : d=94-84=10

The recursive rule for an arithmetic sequence is

[tex]f(n)=f(n-1)+d[/tex]

So, the recursive rule for the given arithmetic sequence is

[tex]f(n)=f(n-1)+10[/tex]

where, f(1)=84 and n ≥ 2.

Explicit rule for the arithmetic sequence is

[tex]f(n)=a+(n-1)d[/tex]

So, the explicit rule for the given arithmetic sequence is

[tex]f(n)=84+(n-1)10[/tex]

where, n ≥ 1.

Therefore, the recursive and explicit rules are [tex]f(n)=f(n-1)+10[/tex] and [tex]f(n)=84+(n-1)10[/tex] respectively.

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