4a + 4b is one possible answer.
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a+a+a+a+b+b - add the like terms =4a+2b 4a and 2b cannot be added because they are not like terms.
(a + 2 - b) (a + 2 + b)
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It is equal to a^3 + b^3. It can also be expressed as (a + b)*(a^2 - ab + b^2) or (a^6 - b^6)/(a^3 - b^3) or many other expressions.
b + a + b - a = 2b