Answer
The next number is -5120.
Explanation
To get the next number, we first carefully examine the given sequence of numbers
5, -20, 80, -320, 1280,
On careful examination, we will observe that the next term is equal to the previous term multiplied by -4
(Next term) = (Previous term) × -4
To Check,
-20 = 5 × -4
80 = -20 × -4
-320 = 80 × -4
1280 = -320 × -4
so, the next term will be
Next term = (Last term) × -4
Next term = 1280 × -4
= -5120
Hope this Helps!!!