Without further restrictions it can be any of an infinite number of formulae.
For example, U{n} = (11n⁴ - 110x³ + 385x² - 518x + 176)/8 which gives the next term as 42.
However, if it is an ARITHMETIC SEQUENCE (as I suspect your teacher wants), then the nth term is found:
Common difference: (-3) - (-7) = 4
→ 0th term is -7 - 4 = -11
→ nth term U{n} = 4n - 11
Chat with our AI personalities
The nth term is: 5-2n
It is: nth term = 5-4n and so the next term will be -19
If you mean -1 3 7 11 15 then the nth term is 4n-5 and so the next term will be 19
2n+3. If 5 is the first term, then it is 2n + 3 (2×1 = 2 + 3 = 5 and 2×2 + 3 = 7)
Un = (-1)n*(2n - 1)