To simplify the expression, we can start by combining like terms. The terms involving \( b^2 \) are as follows:
\[ -10b^2 - 10b^2 - 4b^2 + 9b^2 + 8b^2 - 10b^2 \]
Now, let's combine these step by step:
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Combine the negative \( b^2 \) terms: \[ -10b^2 - 10b^2 - 4b^2 - 10b^2 = -34b^2 \]
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Combine the positive \( b^2 \) terms: \[ 9b^2 + 8b^2 = 17b^2 \]
Now combine the results: \[ -34b^2 + 17b^2 = -34b^2 + 17b^2 = -17b^2 \]
So, the simplified expression is: \[ \boxed{-17b^2} \]