Answer:
-1
Step-by-step explanation:
1 1
2 = (A1)² - 1 = 1² - 1 = 0
3 = (A2)² - 1 = 0² - 1 = -1
4 = (A3)² - 1 = (-1)² - 1 = 0
5 = (A4)² - 1 = 0² - 1 = -1
6 = (A5)² - 1 = (-1)² - 1 = 0
7 = (A6)² - 1 = 0² - 1 = -1
8 = (A7)² - 1 = (-1)² - 1 = 0
9 = (A8)² - 1 = 0² - 1 = -1
