Question

Find the first four terms of the following sequence. an = (-1)"+¹n² a1 a2 a3 11 a4

Answer 1

The given sequence is defined by the formula: an = (-1)^(n²).

To find the first four terms of the sequence, we substitute the values of n into the formula:

a1 = (-1)^(1²) = (-1)^1 = -1

a2 = (-1)^(2²) = (-1)^4 = 1

a3 = (-1)^(3²) = (-1)^9 = -1

a4 = (-1)^(4²) = (-1)^16 = 1

Therefore, the first four terms of the sequence are:

a1 = -1

a2 = 1

a3 = -1

a4 = 1

Hope that helped!