Final answer:
The 8th term of the geometric sequence -1, 4, -16, ... is 16384.
Step-by-step explanation:
The 8th term of the geometric sequence -1, 4, -16, ... can be found using the formula a * r^(n-1), where a is the first term and r is the common ratio. In this sequence, the first term is -1 and the common ratio is -4. Substituting these values into the formula, we get:
-1 * (-4)^(8-1) = -1 * (-4)^7 = -1 * (-16384) = 16384
Therefore, the 8th term of the sequence is 16384.