Let's break this down step by step.
First, we need to find the sum of \(9x^2 - 5x + 8\) and \(-x^2 + 4x + 10\).
- Finding the first sum: \[ (9x^2 - 5x + 8) + (-x^2 + 4x + 10) \] Combine like terms: \[ (9x^2 - x^2) + (-5x + 4x) + (8 + 10) = 8x^2 - x + 18 \]
Next, we need to find the sum of \(x^2 - 6x + 10\) and \(7x^2 + 11x + 4\).
- Finding the second sum: \[ (x^2 - 6x + 10) + (7x^2 + 11x + 4) \] Combine like terms: \[ (x^2 + 7x^2) + (-6x + 11x) + (10 + 4) = 8x^2 + 5x + 14 \]
Now, we need to subtract the second sum from the first sum: \[ (8x^2 - x + 18) - (8x^2 + 5x + 14) \] Distributing the negative: \[ 8x^2 - x + 18 - 8x^2 - 5x - 14 \] Combine like terms: \[ (8x^2 - 8x^2) + (-x - 5x) + (18 - 14) = 0 - 6x + 4 = -6x + 4 \]
Thus, the final answer is: \[ \boxed{-6x + 4} \]