Question

What is the sum of `(-x^2+9) + (-3x^2-11x+4)`?

Answer 1

`-4x^2 - 11x +13`

Explanation:

Add
`(−x^2+9)+(−3x^2−11x+4)`

1) Clear the parentheses
`−x^2+9−3x^2−11x+4`

2) Collect like terms
`-x^2 - 3x^2   - 11x    +9+4`

3) Combine like terms
`-x^2 - 3x^2    - 11x    +9+4`
`color(white)(...)` ╲ `color(white)(.)`╱ `color(white)(......................)`╲   ╱
`color(white)(..)` `-4x^2        - 11x` `color(white)(..)+ 13`

Answer:
`-4x^2 - 11x +13`