Question

General term for the following sequence.
-3, 6, -9, 12, -15, . . .

Answer 1

that terms has alternating sign, -,+,-,+,-,+,... it is (-1)^n
3,6,9,12,15,... it is like a multiple of 3.
therefore it is (-1)^n * 3n
with n = 1,2,3,4,...

Answer 2

Thank you I worked it out at and got (3n) -1^n which is the same thing :)