To simplify this expression, we first need to multiply the two terms together:
8^-4 x 8^-5 = 8^(-4 + -5) = 8^-9
Next, we simplify 8^-9 to get the final answer:
8^-9 = 1/8^9 = 1/134217728
Therefore, the simplified expression is 1/134217728 or 8^-9.
To simplify this expression, we first need to multiply the two terms together:
8^-4 x 8^-5 = 8^(-4 + -5) = 8^-9
Next, we simplify 8^-9 to get the final answer:
8^-9 = 1/8^9 = 1/134217728
Therefore, the simplified expression is 1/134217728 or 8^-9.