Multiply each number by -2 to get the next number:
-48, 96, -192
An arithmetic sequence goes from one value to the next by adding or subtracting a specified value.
1, 2, 3, 4, 5
would be +1 each time
A geometric sequence goes from one value to the next by multiplying or dividing by a specified value.
2, 6, 18, 54, 162
would be *3 each time
