You can put this solution on YOUR website! From -1 to 2, we're multiplying by -2
From 2 to -4, we're multiplying by -2
From -4 to 8, we're multiplying by -2
and so on
The rule is this:
to get the next term, we multiply the previous term by -2
So the term after 8 is -16 because
8 times -2 = -16
and the term after -16 is 32 because
-16 times -2 = 32
etc etc