(−x
2
−5x)−(−6x
2
+5x+6)
First, let's distribute the negative sign in the second expression:
= (-x^2 - 5x) - (-6x^2 + 5x + 6)
Now, we can remove the parentheses and simplify:
= -x^2 - 5x + 6x^2 - 5x - 6
Combine like terms:
= 6x^2 - x^2 - 5x - 5x - 6
= 5x^2 - 10x - 6
Therefore, the simplified expression is 5x^2 - 10x - 6.