The denominator in 4/6 is wrong because 3 times 3 is not 6.
(Also, even though 4/6 is the wrong fraction, why did you not reduce it before posting your answer? We should always reduce fractions to lowest terms, before reporting them in a final answer.)
Given: (x + 2/3)(x - 2/3)
In time, you will recognize this factorization pattern as the factorization of a difference of squares.
You can then immediately write the difference of the two squares, and simplify.
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