What is the next number in the sequence 7 2 -1 -2 -1?

Answer 1

7, 2, -1, -2, -1 the next number in the sequence is 2.

A constant difference of -5 is applied at each step with multiples of 2 increasing by 1 at each step being added.

7 - 5 + 0x2 = 2

2 - 5 + 1x2 = -1

-1 -5 + 2x2 = -2

-2 -5 + 3x2 = -1

-1 -5 + 4x2 = 2

2 - 5 + 5x2 = 7