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Any number that you choose can be the next number. It is easy to find a rule based on a polynomial of order 5 such that the first five numbers are as listed in the question followed by the chosen next number. There are also non-polynomial solutions. Short of reading the mind of the person who posed the question, there is no way of determining which of the infinitely many solutions is the "correct" one.
One possible solution is to consider U(n) = (2*n^4 - 20*n^3 + 97*n^2 - 715*n + 2424)/6 for n = 1, 2, 3, ...and according to that solution, the next number is -17.
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What is next in the sequence 298 209 129 58 -4?
At each step the number being subtracted is reduced by 9 298 - 89 = 209 209 - 80 = 129 129 - 71 = 58 58 - 62 = -4 -4 - 53 = -57..........which is the next number.
What is next number in series 298 209 129 58 -4?
-57
298 209 129 58 -4 what's the next number in the series?
-57
What is the next number in the series 298 209 129 58 and -4?
-57 298 - 89 = 209 209 - 80 = 129 129 - 71 = 58 58 - 62 = -4 -4 - 53 = -57 notice every number is subtracted by 9 less than the previous number's subtrator
What is the next number in the number sequence 298 209 129 58 -4?
-57 (each number that is subtracted from the first is 9 different from the previous (i.e. 298-89=209-80=129-71=58-62=-4-53=-57). As you can see, the amounts that are substracted are 89, 80, 71, 62, 53 (all 9 different from the one before it.)
