Final answer:
The simplified polynomial in standard form of the expression

Step-by-step explanation:
To simplify the polynomial
, we first expand the binomial
This gives us x^2 - 8x + 16. Therefore, the expression now becomes

Simplifying this further, we distribute the 3 to each term in the parenthesis, giving us
Simplified, this results in

Our final simplified polynomial in standard form is thus

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