Question

Plz help with this math problem ​

Answer 1

D. -3r^2 + 11r + 9

Explanation:

8r + 4r^2 + 3r + 9 - 7r^2

shift somethings around so it's easier to tell

4r^2 - 7r^2 + 8r + 3r + 9

simplify/add

-3r^2 + 11r + 9