To evaluate the expression \( 9 \div -1 + (-8)^2 \), follow these steps:
-
Calculate \( 9 \div -1 \): \[ 9 \div -1 = -9 \]
-
Calculate \( (-8)^2 \): \[ (-8)^2 = 64 \]
-
Now combine the results: \[ -9 + 64 \]
-
Perform the addition: \[ -9 + 64 = 55 \]
Thus, the final result is: \[ \boxed{55} \]