Question

What are the next three terms of the sequence 1, -3, 9, -27,…?


-54, 162, -486

-81, 243, -729

81, -243, 729

57, -162, 486

Answer 1

81, -243, 720, you multiply every number by -3

Answer 2

This is a Geometric sequence:
\[a_n=a_1r^{n-1}\]
Where
\[a_1=1, and, r=-3\]
All you have to do is to workout the 4th term.