Question

Evaluate (a+b)^3-(a-b) ^3​

Answer 1

Answer:

0 is the correct answer

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Answer 2

Answer:

$2b^3+6ab^2$

Step-by-step explanation:

$(a+b)^3=a^3+b^3+3a^2b+3ab^2$------1

$(a-b)^3=a^3-b^3-3a^2b+3ab^2$------2

Let us subtract 2 from 1.

$(a+b)^3-(a-b) ^3=a^3-a^3+b^3+b^3+3a^2b+3a^2b+3ab^2-3ab^2$

$(a+b)^3-(a-b) ^3=2b^3+6a^2b$