factorize: [a+b]^3 - a- b
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Answer:
a^3+b^3+3ab-(a+b)
Step-by-step explanation:
(a+b)^3=(a+b)(a+b)(a+b)= a^3+b^3+3ab
(a+b)^3-a-b=a^3+b^3+3ab-a-b=a^3+b^3+3ab-(a+b)
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