I cannot understand this...!

I seem to remember myjinxin had a very similar kata. With a name like "TTT.261" probably :/

Thank you!

Great kata!

I've now modified the description, so that it is clear, that x is the index in the sequence.
The sequence has more than 3 values, because it might be easier for people to find a pattern.

The syntax errors are now fixed. Thank you for reporting.

Solutions like this are not possible anymore. Thank you for pointing out the issue.

Yes of maximum degree 2.

Is it always a polynomial?

https://www.codewars.com/kata/reviews/5fe4c778cbd81500013a6627/groups/5fe4d343f46a6f000179d71e

I don't remember if there already is a kata with this task. The most similar I've found is https://www.codewars.com/kata/59dfa63727ee00ac4700023d.

It's not clear from the description that x is the index if the sequence. And why does it contain more than 3 numbers?

Sample tests:

  [[12, 12, 14, 18, 24], 'f(x) = x^2 - x + 12'];
                                               ^

SyntaxError: Unexpected token ';'

ReferenceError: assert is not defined

Thanks

Fixed.