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11 September, 04:57

Factorize 9 (a+1) ^2-81

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  1. 11 September, 08:36
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    Answer:9a^2+18a-72

    Step-by-step explanation:

    9 (a+1) ^2-81

    9 (a+1) (a+1) - 81

    Open brackets

    9 (a^2+a+a+1) - 81

    9 (a^2+2a+1) - 81

    9a^2+18a+9-81

    9a^2+18a-72
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