Find the nth term of a sequence. -5, -8, -11, -14, -17
Question
Find the nth term of a sequence. -5, -8, -11, -14, -17
Solution
The given sequence is a linear sequence, which means it increases or decreases at a constant rate. In this case, the sequence is decreasing by 3 each time.
The nth term of a linear sequence can be found using the formula:
nth term = a + (n - 1)d
where:
- a is the first term in the sequence
- d is the common difference between the terms
- n is the position of the term in the sequence
For this sequence, a = -5 (the first term) and d = -3 (the difference between the terms).
Substituting these values into the formula gives:
nth term = -5 + (n - 1)(-3)
Simplifying this gives:
nth term = -5 - 3n + 3
Finally, simplifying further gives:
nth term = -2 - 3n
So, the nth term of the sequence -5, -8, -11, -14, -17 is -2 - 3n.
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