Find the 8th term of -1, 1, 3, ...

Logan Knox

Logan Knox

Answered question

2022-09-25

Find the 8th term of -1, 1, 3, ...

Answer & Explanation

efterynzl

efterynzl

Beginner2022-09-26Added 12 answers

This appears to be an arithmetic sequence, as the numbers are increasing by 2 each time.
The formula for finding the nth term in an arithmetic sequence is:
a n = a 1 + ( n - 1 ) d
a1, the first term in this sequence is -1.
d, or the common difference is 2.
Plug this information into the formula:
a n = - 1 + ( n - 1 ) 2
a n = 2 n - 3
Now plug in 8 for n to find a 8 , or the 8th term in the sequence:
a 8 = 2 ( 8 ) - 3
a 8 = 13

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