pls explain to me how to get the answer to (a+b)^3

pls explain to me how to get the answer to (a+b)^3

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Do you know pascal's triangle and/or the binomial theorem?

(a+b)^3 = (a+b)(a+b)(a+b)
now simply multiply these factors and get the answer

can u help me without using the long method?

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