\[-8 - (-10)^2\]

To solve this problem, we need to simplify the expression using the order of operations (PEMDAS). According to the order of operations, we should perform the operation inside the parentheses first.

Since there is no operation inside the parentheses, we can move on to the next step.

To square a number, we multiply it by itself. In this case, let's square -10:

\((-10)^2\) equals \(-10 \times -10 = 100\).

Now we can substitute this value back into the original expression:

\[-8 - 100\]

To subtract two numbers, we simply subtract the second number from the first number:

\[-8 - 100 = -108\]

So, \(-8 - (-10)^2\) equals \(-108\).