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8 January, 01:56

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

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  1. 8 January, 05:36
    0
    7r³ - 3r² + 20r

    Step-by-step 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
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