Question

5. (9r 3 + 5r 2 + 11r) + (-2r 3 + 9r - 8r 2)

Answer 1

7r³ - 3r² + 20r

Explanation:

(9r³ + 5r² + 11r) + (-2r³ + 9r - 8r²)

You can get rid of the parentheses since there is nothing to distribute.

9r³ + 5r² + 11r - 2r³ + 9r - 8r²

Combine like factors.

7r³ - 3r² + 20r