galal74 galal74

10-05-2020
Mathematics

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factorize 9(a+1)^2-81

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Chelboy Chelboy

10-05-2020

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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