question\nfind the sum of -9x^2 - 4x - 1 and 5x + 10.

Explanation:

Step1: Write the sum expression

$(-9x^{2}-4x - 1)+(5x + 10)$

Step2: Remove parentheses

$-9x^{2}-4x - 1+5x + 10$

Step3: Combine like - terms

$-9x^{2}+(-4x + 5x)+(-1 + 10)$ $-9x^{2}+x + 9$

Answer:

$-9x^{2}+x + 9$